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Derivatives (Forward Contracts) (Details)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
JPY (¥)
Mar. 31, 2014
Forward contracts
USD ($)
Dec. 31, 2013
Forward contracts
USD ($)
Dec. 31, 2014
Forward contracts
USD ($)
Dec. 31, 2014
Forward contracts
SEK
Derivative Instruments, Gain (Loss) [Line Items]            
Notional amount $ 1,100.0invest_DerivativeNotionalAmount ¥ 134,200.0invest_DerivativeNotionalAmount   $ 20.4invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
$ 33.1invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
257.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Realized and unrealized gains (losses)     (0.3)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
0.1us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
   
Derivative Liability       $ (0.1)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember