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Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 309.8 $ 262.9
Less accumulated depreciation and amortization (88.4) (79.8)
Total property and equipment, net 221.4 183.1
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 15.3 6.0
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 9.1 9.0
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 31.6 29.2
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 82.5 80.7
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 83.2 80.7
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 88.1 $ 57.3