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Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total cost $ 505.6 $ 426.3
Less accumulated depreciation and amortization (121.3) (105.0)
Total property and equipment, net 384.3 321.3
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 13.0 12.8
Computer software and hardware    
Property, Plant and Equipment [Line Items]    
Total cost 33.0 32.7
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total cost 165.2 130.2
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total cost 120.7 102.5
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total cost $ 158.2 $ 132.6