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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Senior Notes | Senior Notes Due 2021    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value $ 282.2  
Senior Notes | Senior notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value   $ 623.1
Senior Notes | Senior notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value   310.6
Line of Credit | Term loan A    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value   307.7
Line of Credit | Term loan B    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value   $ 116.7