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Capital and Financing Transactions - Credit Risk-Related Contingent Features (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Capital and Financing Transactions [Abstract]  
Fair value of derivatives in net liability position $ 13.8us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Aggregate termination value $ 13.4us-gaap_AssetsNeededForImmediateSettlementAggregateFairValue