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Fair Value - Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fair Value of Financial Statements [Line Items]    
Long-Term Debt, Including Current Portion - Carrying Amount $ 1,578.4 $ 1,605.0
Level 2 [Member]    
Fair Value of Financial Statements [Line Items]    
Long-Term Debt, Including Current Portion - Fair Value $ 1,708.0 $ 1,676.0