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Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair Value of Financial Instruments [Line Items]    
Long-Term Debt, Including Long-Term Debt Due Within One Year - Carrying Amount $ 1,575.2 $ 1,605.0
Level 2 [Member]    
Fair Value of Financial Instruments [Line Items]    
Long-Term Debt, Including Long-Term Debt Due Within One Year - Fair Value $ 1,647.6 $ 1,676.0