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Derivative Instruments and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Derivative asset, gross | $ 63.3 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 59.8 us-gaap_DerivativeFairValueOfDerivativeAsset | [1]
Derivative asset, gross liability | (27.5)us-gaap_DerivativeAssetFairValueGrossLiability | (6.0)us-gaap_DerivativeAssetFairValueGrossLiability |
Derivative asset, net | 35.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 53.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |
Cash collateral (received) pledged | 0 us-gaap_DerivativeCollateralObligationToReturnCash | 0 us-gaap_DerivativeCollateralObligationToReturnCash |
Derivative asset, net amount recognized in balance sheet | 35.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 53.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral |
Derivative liability, gross | (314.9)us-gaap_DerivativeFairValueOfDerivativeLiability | (49.2)us-gaap_DerivativeFairValueOfDerivativeLiability | [1]
Derivative liability, gross asset | 27.5 us-gaap_DerivativeLiabilityFairValueGrossAsset | 6.0 us-gaap_DerivativeLiabilityFairValueGrossAsset |
Derivative liability, net | (287.4)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | (43.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral |
Cash collateral (received) pledged | 90.5 us-gaap_DerivativeCollateralRightToReclaimCash | 0 us-gaap_DerivativeCollateralRightToReclaimCash |
Derivative liability, net amount recognized in balance sheet | $ (196.9)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral | $ (43.2)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral |
[1] | Certain immaterial amounts have been revised to correct the classification of derivatives.

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