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Revenue - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Business incentive plan assets [Line Items]        
Business Incentive Plan Assets $ 190.8 $ 173.0    
Capitalized Contract Cost, Amortization 65.5 65.0 $ 53.5  
Upfront Incentive Payment 56.0 0.0    
Contract with Customer, Asset, Net 47.2     $ 41.7
Other Assets [Member]        
Business incentive plan assets [Line Items]        
Upfront Incentive Payment $ 49.8 $ 0.0