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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 922.0 $ 874.5
Accumulated depreciation and amortization (581.1) (563.9)
Property and equipment, net 340.9 310.6
Datacenter and other computer equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 682.8 667.4
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property and equipment 24.8 23.8
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 153.8 150.5
Construction in process    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 60.6 $ 32.8