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Investments - Available-for-sale Securities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale Securities [Abstract]    
Cost $ 19.8us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 19.6us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gain 0.3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 0.2us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Loss 0.8us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 0.9us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Value $ 19.3us-gaap_AvailableForSaleSecuritiesNoncurrent [1] $ 18.9us-gaap_AvailableForSaleSecuritiesNoncurrent [1]
[1] As of March 31, 2015, the aggregate amount of available-for-sale corporate debt securities maturing in one year or less was $0.4 million, in one year to less than three years was $1.7 million, in three years to less than five years was $3.0 million, and in five or more years was $5.9 million.