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Derivative Instruments and Hedging Activities - Offsetting Derivative Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Document Period End Date | Mar. 31, 2015 |  |
Derivative asset, gross | $ 67.8 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 31.6 us-gaap_DerivativeFairValueOfDerivativeAsset | [1]
Derivative asset, gross liability | (13.8)us-gaap_DerivativeAssetFairValueGrossLiability | (8.6)us-gaap_DerivativeAssetFairValueGrossLiability |
Derivative asset, net | 54.0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 23.0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral |
Cash collateral (received) pledged | 0 us-gaap_DerivativeCollateralObligationToReturnCash | 0 us-gaap_DerivativeCollateralObligationToReturnCash |
Derivative asset, net amount recognized in balance sheet | 54.0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 23.0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral |
Derivative liability, gross | (180.8)us-gaap_DerivativeFairValueOfDerivativeLiability | (65.3)us-gaap_DerivativeFairValueOfDerivativeLiability | [1]
Derivative liability, gross asset | 13.8 us-gaap_DerivativeLiabilityFairValueGrossAsset | 8.6 us-gaap_DerivativeLiabilityFairValueGrossAsset |
Derivative liability, net | (167.0)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | (56.7)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral |
Cash collateral (received) pledged | 3.7 us-gaap_DerivativeCollateralRightToReclaimCash | 0 us-gaap_DerivativeCollateralRightToReclaimCash |
Derivative liability, net amount recognized in balance sheet | $ (163.3)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral | $ (56.7)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral |
[1] | Certain immaterial amounts have been revised to correct the classification of derivatives.

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