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Investments - Available-for-sale Securities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities [Abstract]      
Cost $ 19.6us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 18.3us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 27.4us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gain 0.2us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 0.5us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Loss 0.9us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 0.6us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 1.1us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Value 18.9us-gaap_AvailableForSaleSecuritiesNoncurrent [1] 17.7us-gaap_AvailableForSaleSecuritiesNoncurrent [1] 26.8us-gaap_AvailableForSaleSecuritiesNoncurrent
Net Proceeds 3.6us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds 16.1us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds 1.5us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Gross Realized Gain 0.2us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 2.2us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross Realized Loss $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
[1] As of December 31, 2014, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.6 million, in one year to less than three years was $1.7 million, in three years to less than five years was $2.6 million, and in five or more years was $5.9 million.