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Financial Statement Details Financial Statement Details - Property and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 222.3 $ 200.4
Accumulated depreciation and amortization (65.5) (54.8)
Property and equipment, net 156.8 145.6
Building (1)    
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 8.4 5.7
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 27.7 25.6
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 61.9 33.8
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 79.1 41.7
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 39.2 $ 87.6