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Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total cost $ 402.6 $ 262.9
Less accumulated depreciation and amortization (101.6) (79.8)
Total property and equipment, net 301.0 183.1
Building and land    
Property, Plant and Equipment [Line Items]    
Total cost 15.5 6.0
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total cost 12.2 9.0
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Total cost 32.8 29.2
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total cost 97.5 80.7
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total cost 96.6 80.7
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total cost $ 148.0 $ 57.3