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Debt Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Debt [Abstract]  
Interest Payable $ 9.4
Early Repayment of Senior Debt 0.6
Debt Instrument, Repurchased Face Amount 0.6
Debt Instrument, Repurchase Amount 0.6
Proceeds from (Repayments of) Debt $ 0