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Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total cost $ 453.1 $ 426.3
Less accumulated depreciation and amortization (107.0) (105.0)
Total property and equipment, net 346.1 321.3
Building and land    
Property, Plant and Equipment [Line Items]    
Total cost 15.5 15.5
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total cost 12.8 12.8
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Total cost 31.7 32.7
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total cost 129.5 130.2
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total cost 119.5 102.5
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total cost $ 144.1 $ 132.6