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Property, Plant and Equipment, Net - Balances (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 148.4 $ 153.6
Less accumulated depreciation (105.0) (112.9)
Property, plant and equipment, net 43.4 40.7
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 38.1 35.7
Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 110.3 $ 117.9