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Geographic Areas (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Property and equipment, net $ 310.6 $ 341.9  
Revenue 1,391.7 1,106.8 $ 844.8
United States      
Segment Reporting Information [Line Items]      
Property and equipment, net 293.6 323.7  
Revenue 706.5 575.7 455.9
International      
Segment Reporting Information [Line Items]      
Property and equipment, net 17.0 18.2  
Revenue $ 685.2 $ 531.1 $ 388.9