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Derivative Financial Instruments Offsetting Assets (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Offsetting Derivative Assets [Abstract]    
Derivative Assets Collateral $ 0 $ 0
Gross Amount Recognized 194.4 82.6
Gross Amounts Not Offset Permitted Under Master Netting Agreements (179.7) (47.1)
Net Amount $ 14.7 $ 35.5