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Financial Instruments and Fair Value - Narrative (Details)
SFr in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2018
CHF (SFr)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 31, 2018
USD ($)
Fair Value Disclosures [Abstract]        
Equity method investments   $ 15.7 $ 15.3  
Amortized Cost        
Business Acquisition, Contingent Consideration [Line Items]        
Long term debt   2,500.0 2,500.0  
Foreign Exchange Contract | Net Investment Hedging | Designated as Hedging Instrument        
Business Acquisition, Contingent Consideration [Line Items]        
Term of contract 5 years      
Notional amount | SFr SFr 750      
Expected cash and contra interest per year       $ 25.0
Gain, net of tax   12.2    
Foreign Exchange Contract | Net Investment Hedging | Designated as Hedging Instrument | Interest Expense        
Business Acquisition, Contingent Consideration [Line Items]        
Contra interest expense   $ 6.1 $ 5.6