Borrowings (Details) - USD ($)
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1 Months Ended |
12 Months Ended |
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Feb. 29, 2020 |
Aug. 31, 2019 |
Feb. 28, 2018 |
Feb. 29, 2020 |
Feb. 28, 2019 |
Feb. 28, 2018 |
Jul. 31, 2019 |
Jun. 30, 2019 |
Oct. 31, 2018 |
Sep. 30, 2018 |
Aug. 31, 2018 |
Nov. 30, 2017 |
Jul. 31, 2017 |
May 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Nov. 30, 2014 |
May 31, 2013 |
Short-term Debt |
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Short-term borrowings |
$ 238,900,000
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$ 238,900,000
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$ 791,500,000
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Long-term Debt |
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Other, Current |
11,700,000
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11,700,000
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Other, Long-term |
13,600,000
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13,600,000
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Other, Total |
25,300,000
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25,300,000
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28,900,000
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Long-term debt, Current |
734,900,000
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734,900,000
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1,065,200,000
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Long-term debt, Long-term |
11,210,800,000
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11,210,800,000
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11,759,800,000
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Long-term debt, Total |
$ 11,945,700,000
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11,945,700,000
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12,825,000,000.0
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Partial repayment |
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2,195,300,000
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62,800,000
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$ 7,128,700,000
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Make-whole payment |
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$ 1,500,000
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$ 73,600,000
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Unsecured debt [Member] |
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Long-term Debt |
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Percentage of outstanding principal amount as redemption price |
100.00%
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Unsecured debt [Member] | Senior credit facility, Term loan [Member] |
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Long-term Debt |
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Unsecured debt, Current |
$ 0
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0
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Unsecured debt, Long-term |
0
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0
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Unsecured debt, Total |
0
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0
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492,800,000
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Unsecured debt [Member] | Term loan credit facility [Member] |
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Long-term Debt |
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Unsecured debt, Current |
24,500,000
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24,500,000
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Unsecured debt, Long-term |
1,271,200,000
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1,271,200,000
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Unsecured debt, Total |
1,295,700,000
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1,295,700,000
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1,486,400,000
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Unsecured debt [Member] | Senior notes [Member] |
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Long-term Debt |
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Unsecured debt, Current |
698,700,000
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698,700,000
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Unsecured debt, Long-term |
9,926,000,000.0
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9,926,000,000.0
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Unsecured debt, Total |
10,624,700,000
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10,624,700,000
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10,816,900,000
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Unsecured debt [Member] | Three-Year Term Facility [Member] |
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Long-term Debt |
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Unsecured debt, Total |
499,600,000
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499,600,000
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Debt instrument, face amount |
$ 500,000,000.0
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$ 500,000,000.0
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$ 500,000,000.0
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Interest rate |
2.80%
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2.80%
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LIBOR margin |
1.13%
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1.13%
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Unsecured debt [Member] | Five-Year Term Facility [Member] |
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Long-term Debt |
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Unsecured debt, Total |
$ 317,100,000
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$ 317,100,000
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Debt instrument, face amount |
$ 1,000,000,000.0
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$ 1,000,000,000.0
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1,000,000,000.0
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Interest rate |
2.90%
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2.90%
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LIBOR margin |
1.25%
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1.25%
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Partial repayment |
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$ 645,000,000.0
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Unsecured debt [Member] | Term Credit Agreement [Member] |
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Long-term Debt |
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Debt instrument, face amount |
$ 1,500,000,000.0
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1,500,000,000.0
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1,500,000,000
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Unsecured debt [Member] | 2019 Five-Year Term Facility [Member] |
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Long-term Debt |
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Unsecured debt, Total |
479,000,000.0
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479,000,000.0
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Debt instrument, face amount |
$ 491,300,000
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$ 491,300,000
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$ 491,300,000
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Interest rate |
2.50%
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2.50%
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LIBOR margin |
0.88%
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0.88%
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Unsecured debt [Member] | May 2013 Eight Year Senior Notes [Member] |
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Long-term Debt |
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Unsecured debt, Total |
$ 499,200,000
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$ 499,200,000
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498,600,000
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Debt instrument, face amount |
|
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$ 500,000,000.0
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Basis points above adjusted treasury rate |
50.00%
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Coupon rate of notes |
3.75%
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3.75%
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Unsecured debt [Member] | May 2013 Ten Year Senior Notes [Member] |
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Long-term Debt |
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Unsecured debt, Total |
$ 1,046,400,000
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|
$ 1,046,400,000
|
1,045,400,000
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Debt instrument, face amount |
|
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$ 1,050,000,000.0
|
Basis points above adjusted treasury rate |
50.00%
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Coupon rate of notes |
4.25%
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4.25%
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Unsecured debt [Member] | November 2014 Five Year Senior Notes [Member] |
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Long-term Debt |
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Unsecured debt, Total |
$ 0
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$ 0
|
399,100,000
|
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Debt instrument, face amount |
|
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$ 400,000,000.0
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|
Basis points above adjusted treasury rate |
50.00%
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Coupon rate of notes |
3.875%
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3.875%
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Unsecured debt [Member] | November 2014 Ten Year Senior Notes [Member] |
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Long-term Debt |
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Unsecured debt, Total |
$ 397,000,000.0
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$ 397,000,000.0
|
396,400,000
|
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Debt instrument, face amount |
|
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|
$ 400,000,000.0
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|
Basis points above adjusted treasury rate |
50.00%
|
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Coupon rate of notes |
4.75%
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|
4.75%
|
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Unsecured debt [Member] | December 2015 Senior Notes [Member] |
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Long-term Debt |
|
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|
|
|
|
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|
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|
Unsecured debt, Total |
$ 396,300,000
|
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|
$ 396,300,000
|
395,800,000
|
|
|
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|
Debt instrument, face amount |
|
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|
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|
$ 400,000,000.0
|
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|
Basis points above adjusted treasury rate |
50.00%
|
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|
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|
Coupon rate of notes |
4.75%
|
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|
4.75%
|
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Unsecured debt [Member] | December 2016 Senior Notes [Member] |
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Long-term Debt |
|
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|
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|
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|
Unsecured debt, Total |
$ 595,900,000
|
|
|
$ 595,900,000
|
595,400,000
|
|
|
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|
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|
Debt instrument, face amount |
|
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|
|
|
|
|
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|
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|
$ 600,000,000.0
|
|
|
|
Basis points above adjusted treasury rate |
25.00%
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
3.70%
|
|
|
3.70%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | May 2017 Five Year Senior Notes [Member] |
|
|
|
|
|
|
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|
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|
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|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 497,800,000
|
|
|
$ 497,800,000
|
496,800,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 500,000,000.0
|
|
|
|
|
Basis points above adjusted treasury rate |
15.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
2.70%
|
|
|
2.70%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | May 2017 Ten Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 496,100,000
|
|
|
$ 496,100,000
|
495,600,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
|
|
|
|
|
500,000,000.0
|
|
|
|
|
Basis points above adjusted treasury rate |
20.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
3.50%
|
|
|
3.50%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | May 2017 Thirty Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 493,000,000.0
|
|
|
$ 493,000,000.0
|
492,900,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 500,000,000.0
|
|
|
|
|
Basis points above adjusted treasury rate |
25.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
4.50%
|
|
|
4.50%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | November 2017 Two Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 0
|
|
|
$ 0
|
598,600,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
|
|
|
$ 600,000,000.0
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
10.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
2.00%
|
|
|
2.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | November 2017 Three Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 698,700,000
|
|
|
$ 698,700,000
|
696,800,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
|
|
|
700,000,000.0
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
10.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
2.25%
|
|
|
2.25%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | November 2017 Five Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 695,500,000
|
|
|
$ 695,500,000
|
693,900,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
|
|
|
$ 700,000,000.0
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
15.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
2.65%
|
|
|
2.65%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | February 2018 Five Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 597,000,000.0
|
|
|
$ 597,000,000.0
|
596,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
600,000,000.0
|
|
|
600,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
13.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
3.20%
|
|
|
3.20%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | February 2018 Ten Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 694,300,000
|
|
|
$ 694,300,000
|
693,800,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
700,000,000.0
|
|
|
700,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
15.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
3.60%
|
|
|
3.60%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | February 2018 Thirty Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 592,100,000
|
|
|
$ 592,100,000
|
592,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
$ 600,000,000.0
|
|
|
$ 600,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
20.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
4.10%
|
|
|
4.10%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | October 2018 Senior Floating Rate Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 647,900,000
|
|
|
$ 647,900,000
|
646,800,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
$ 650,000,000.0
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | October 2018 Seven Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 496,000,000.0
|
|
|
$ 496,000,000.0
|
495,400,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
500,000,000.0
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
20.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
4.40%
|
|
|
4.40%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | October 2018 Ten Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 495,200,000
|
|
|
$ 495,200,000
|
494,700,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
500,000,000.0
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
25.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
4.65%
|
|
|
4.65%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | October 2018 Thirty Year Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 493,000,000.0
|
|
|
$ 493,000,000.0
|
492,900,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
|
|
$ 500,000,000.0
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
30.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
5.25%
|
|
|
5.25%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt [Member] | July 2019 Senior Notes [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Unsecured debt, Total |
$ 793,300,000
|
|
|
$ 793,300,000
|
0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
|
|
|
|
|
|
$ 800,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
Basis points above adjusted treasury rate |
20.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Coupon rate of notes |
3.15%
|
|
|
3.15%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Senior credit facility, Revolving credit loans [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term borrowings |
$ 0
|
|
|
$ 0
|
59,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
$ 2,000,000,000.0
|
|
|
$ 2,000,000,000.0
|
|
|
|
|
|
$ 2,000,000,000.0
|
$ 1,500,000,000
|
|
$ 1,500,000,000
|
|
|
|
|
|
Interest rate |
0.00%
|
|
|
0.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
LIBOR margin |
1.13%
|
|
|
1.13%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Remaining borrowing capacity |
$ 1,749,200,000
|
|
|
$ 1,749,200,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Letters of credit [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
200,000,000.0
|
|
|
200,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Outstanding letters of credit |
11,800,000
|
|
|
11,800,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Commercial paper [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Short-term borrowings |
238,900,000
|
|
|
238,900,000
|
$ 732,500,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long-term Debt |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Debt instrument, face amount |
$ 239,000,000.0
|
|
|
$ 239,000,000.0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Interest rate |
1.90%
|
|
|
1.90%
|
3.00%
|
|
|
|
|
|
|
|
|
|
|
|
|
|