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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]      
Liability contracts collateral $ 0us-gaap_DerivativeLiabilityFairValueOfCollateral $ 0us-gaap_DerivativeLiabilityFairValueOfCollateral  
Assets contracts collateral 0us-gaap_DerivativeAssetFairValueOfCollateral 0us-gaap_DerivativeAssetFairValueOfCollateral  
Total derivative contracts, maturity year 2016    
Gain (Loss) On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring, Net 0.9us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet 0.1us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet 4.4us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet
Cash Flow Hedges Of Forecasted Transactions, Net Of Tax, In Accumulated OCI Gain (Loss) (77.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 31.9us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Cash Flow Hedge Gain (Loss) Expected To Be Reclassified Within 12 Months $ (17.3)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths