Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of decrease in future sales 10.00%  
Decrease of estimated future sales in amount $ 2.1  
Contingent consideration 41.4 $ 45.1
Accrued Expenses    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration 11.8 0.3
Other Long-term Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ 29.6 $ 44.8