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Financial Statement Details - Property and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 241.9 $ 200.4
Accumulated depreciation and amortization (72.3) (54.8)
Property and equipment, net 169.6 145.6
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 6.0 6.0
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 8.5 5.7
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 28.6 25.6
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 67.6 33.8
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 78.1 41.7
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 53.1 $ 87.6