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Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 352.2 $ 262.9
Less accumulated depreciation and amortization (99.0) (79.8)
Total property and equipment, net 253.2 183.1
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 15.5 6.0
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 10.0 9.0
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 33.0 29.2
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 102.2 80.7
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 95.4 80.7
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 96.1 $ 57.3