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Borrowings (Senior Notes) (Details Textual 1) (USD $)
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12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 28, 2013
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Feb. 29, 2012
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Feb. 28, 2011
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Feb. 28, 2013
Senior Notes [Member]
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Aug. 31, 2006
Senior Notes [Member]
August 2006 Senior Notes [Member]
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Feb. 28, 2013
Senior Notes [Member]
August 2006 Senior Notes [Member]
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Feb. 29, 2012
Senior Notes [Member]
August 2006 Senior Notes [Member]
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Aug. 15, 2006
Senior Notes [Member]
August 2006 Senior Notes [Member]
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May 31, 2007
Senior Notes [Member]
Original May 2007 Senior Notes [Member]
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May 14, 2007
Senior Notes [Member]
Original May 2007 Senior Notes [Member]
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Jan. 31, 2008
Senior Notes [Member]
May 2007 Senior Notes [Member]
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Feb. 28, 2013
Senior Notes [Member]
May 2007 Senior Notes [Member]
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Feb. 29, 2012
Senior Notes [Member]
May 2007 Senior Notes [Member]
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Dec. 31, 2007
Senior Notes [Member]
December 2007 Senior Notes [Member]
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Feb. 28, 2013
Senior Notes [Member]
December 2007 Senior Notes [Member]
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Feb. 29, 2012
Senior Notes [Member]
December 2007 Senior Notes [Member]
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Dec. 05, 2007
Senior Notes [Member]
December 2007 Senior Notes [Member]
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Apr. 30, 2012
Senior Notes [Member]
April 2012 Senior Notes [Member]
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Feb. 28, 2013
Senior Notes [Member]
April 2012 Senior Notes [Member]
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Apr. 17, 2012
Senior Notes [Member]
April 2012 Senior Notes [Member]
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Aug. 31, 2012
Senior Notes [Member]
August 2012 Senior Notes [Member]
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Aug. 14, 2012
Senior Notes [Member]
August 2012 Senior Notes [Member]
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| Schedule of Debt [Line Items] | ||||||||||||||||||||||
| Aggregate principal amount of notes | $ 700,000,000 | $ 700,000,000 | $ 500,000,000 | $ 600,000,000 | $ 650,000,000.0 | |||||||||||||||||
| Coupon rate of notes | 7.25% | 7.25% | 7.25% | 8.375% | 6.00% | 4.625% | ||||||||||||||||
| Maturity date of notes | Sep. 30, 2016 | May 31, 2017 | May 31, 2017 | Dec. 31, 2014 | May 31, 2022 | Mar. 31, 2023 | ||||||||||||||||
| Issuance price of debt | 693,100,000 | 496,700,000 | ||||||||||||||||||||
| Unamortized discount on senior notes | 4,000,000 | 3,000,000 | 3,700,000 | 6,900,000 | 1,000,000 | 1,500,000 | 3,300,000 | |||||||||||||||
| Effective interest rate on senior notes | 7.40% | 8.50% | ||||||||||||||||||||
| Aggregate principal amount outstanding | 697,000,000 | 696,300,000 | 700,000,000 | 700,000,000 | 499,000,000 | 498,500,000 | 600,000,000 | |||||||||||||||
| Exchange of senior notes | 700,000,000 | |||||||||||||||||||||
| Net proceeds from issuance of senior notes | $ 2,050,000,000 | $ 0 | $ 0 | $ 591,400,000 | $ 640,600,000 | |||||||||||||||||
| Percentage of outstanding principal amount, Escrowed | 100.00% | |||||||||||||||||||||
| Special mandatory redemption date | Dec. 30, 2013 | |||||||||||||||||||||
| Percentage of outstanding principal amount as redemption price | 100.00% | |||||||||||||||||||||
| Basis points above adjusted treasury rate | 50.00% | |||||||||||||||||||||
| Percentage of outstanding principal amount as Special Mandatory Redemption price | 100.00% | |||||||||||||||||||||