Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

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Subsequent Events (Details) (Senior Notes [Member], USD $)
In Millions, unless otherwise specified
Nov. 30, 2006
Feb. 28, 2013
Senior Secured Notes Due 2021 [Member]
Issuance of Debt [Member]
Subsequent Event [Line Items]    
Debt instrument principal amount $ 2,032.0 $ 1,500.0
Debt instrument stated rate (percent)   5.625%