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Fair Value of Financial Instruments Fair Value of Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Senior notes due 2020    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value $ 623.1 $ 651.6
Senior notes due 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value 310.6 309.1
Term loan A    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value 307.7 327.8
Term loan B    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instruments at fair value $ 116.7 $ 165.0