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Derivative Financial Instruments Derivative Instruments (Offsetting Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Derivative Assets [Abstract]    
Gross Amount Recognized $ 332.5us-gaap_DerivativeFairValueOfDerivativeAsset $ 234.4us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Not Offset Permitted Under Master Netting Agreements (321.5)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction (198.5)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction
Net Amount $ 11.0us-gaap_DerivativeAssets $ 35.9us-gaap_DerivativeAssets