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Fair Value - Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financial Instruments [Abstract]    
Long-Term Debt, Including Current Portion - Carrying Amount $ 1,376.1us-gaap_LongTermDebt $ 1,373.5us-gaap_LongTermDebt
Long-Term Debt, Including Current Portion - Fair Value $ 1,525.4us-gaap_LongTermDebtFairValue $ 1,484.5us-gaap_LongTermDebtFairValue