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Borrowings (Details Textual 1)
In Millions, unless otherwise specified |
12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 1 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. 29, 2012
USD ($)
|
Feb. 28, 2011
USD ($)
|
Feb. 29, 2012
Tranche A Term Loans [Member]
USD ($)
|
May 31, 2011
Tranche B Term Loans [Member]
USD ($)
|
Feb. 29, 2012
Tranche B Term Loans [Member]
USD ($)
|
Feb. 29, 2012
2013 Tranche B Term Loan [Member]
USD ($)
|
Feb. 29, 2012
2015 Tranche B Term Loan [Member]
USD ($)
|
Nov. 30, 1999
Sterling Senior Notes [Member]
USD ($)
|
Nov. 30, 1999
Sterling Senior Notes [Member]
GBP (£)
|
Mar. 31, 2000
Sterling Series B Senior Notes [Member]
GBP (£)
|
Oct. 31, 2000
Sterling Series B Senior Notes [Member]
GBP (£)
|
May 31, 2000
Sterling Series C Senior Notes [Member]
|
Oct. 31, 2000
Sterling Series C Senior Notes [Member]
GBP (£)
|
May 15, 2000
Sterling Series C Senior Notes [Member]
USD ($)
|
May 15, 2000
Sterling Series C Senior Notes [Member]
GBP (£)
|
Aug. 31, 2006
August 2006 Senior Notes [Member]
|
Feb. 29, 2012
August 2006 Senior Notes [Member]
USD ($)
|
Feb. 28, 2011
August 2006 Senior Notes [Member]
USD ($)
|
Aug. 15, 2006
August 2006 Senior Notes [Member]
USD ($)
|
May 31, 2007
Original May 2007 Senior Notes [Member]
|
May 14, 2007
Original May 2007 Senior Notes [Member]
USD ($)
|
Jan. 31, 2008
May 2007 Senior Notes [Member]
USD ($)
|
Feb. 29, 2012
May 2007 Senior Notes [Member]
USD ($)
|
Feb. 28, 2011
May 2007 Senior Notes [Member]
USD ($)
|
Apr. 30, 2012
April 2012 Senior Notes [Member]
USD ($)
|
Apr. 17, 2012
April 2012 Senior Notes [Member]
USD ($)
|
Dec. 31, 2007
December 2007 Senior Notes [Member]
|
Feb. 29, 2012
December 2007 Senior Notes [Member]
USD ($)
|
Feb. 28, 2011
December 2007 Senior Notes [Member]
USD ($)
|
Dec. 05, 2007
December 2007 Senior Notes [Member]
USD ($)
|
Jan. 31, 2002
January 2002 Senior Subordinated Notes [Member]
|
Jan. 23, 2002
January 2002 Senior Subordinated Notes [Member]
USD ($)
|
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| Borrowings (Textual) | ||||||||||||||||||||||||||||||||
| Maximum borrowing amount under credit facility | $ 3,842.0 | $ 1,200.0 | $ 1,800.0 | $ 1,500.0 | $ 300.0 | |||||||||||||||||||||||||||
| Maturity date of credit facility | 2011-06 | 2013-06 | 2015-06 | |||||||||||||||||||||||||||||
| Prepayment of Tranche B loan | 400.0 | |||||||||||||||||||||||||||||||
| LIBOR margin | 1.50% | 2.75% | ||||||||||||||||||||||||||||||
| Senior notes outstanding | 826.6 | 624.7 | 201.9 | |||||||||||||||||||||||||||||
| Credit facility, interest rate | 2.00% | 3.10% | ||||||||||||||||||||||||||||||
| Exchange of senior notes | 75.0 | 74.0 | 74.0 | 700.0 | ||||||||||||||||||||||||||||
| Aggregate principal amount of notes | 121.7 | 75.0 | 120.0 | 80.0 | 700.0 | 700.0 | 600.0 | 500.0 | 250.0 | |||||||||||||||||||||||
| Issuance price of notes | 693.1 | 496.7 | ||||||||||||||||||||||||||||||
| Unamortized discount on senior notes | 5.2 | 3.7 | 4.4 | 6.9 | 1.5 | 2.0 | 3.3 | |||||||||||||||||||||||||
| Coupon rate of notes | 8.50% | 8.50% | 8.50% | 8.50% | 8.50% | 7.25% | 7.25% | 7.25% | 6.00% | 8.375% | 8.125% | |||||||||||||||||||||
| Effective interest rate on senior notes | 7.40% | 8.50% | ||||||||||||||||||||||||||||||
| Net proceeds from issuance of senior notes | 592 | |||||||||||||||||||||||||||||||
| Aggregate principal amount outstanding | 696.3 | 695.6 | 700.0 | 700.0 | 498.5 | 498.0 | ||||||||||||||||||||||||||
| Maturity date of notes | Nov. 30, 2009 | Nov. 30, 2009 | Nov. 30, 2009 | Nov. 30, 2009 | Sep. 30, 2016 | May 31, 2017 | May 31, 2017 | May 31, 2022 | Dec. 31, 2014 | Jan. 31, 2012 | ||||||||||||||||||||||
| Percentage of redemption price | 100.00% | |||||||||||||||||||||||||||||||
| Basis points above Treasury Rate | 0.50% | |||||||||||||||||||||||||||||||
| Additional credit arrangements | 253.8 | 154.2 | ||||||||||||||||||||||||||||||
| Amounts outstanding under additional credit arrangements | $ 110.1 | $ 39.8 | ||||||||||||||||||||||||||||||