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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 874.5 $ 846.7
Accumulated depreciation and amortization (563.9) (504.8)
Property and equipment, net 310.6 341.9
Building    
Property, Plant and Equipment [Line Items]    
Total property and equipment 0.0 36.6
Datacenter and other computer equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 695.3 663.1
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property and equipment 23.8 21.2
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 122.6 118.6
Construction in process    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 32.8 $ 7.2