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Goodwill and Intangible Assets - Government Grants (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets    
Gross carrying amount $ 491.2 $ 436.0
Government grants    
Finite-Lived Intangible Assets    
Gross carrying amount 7.5 7.8
Government grants | Current    
Finite-Lived Intangible Assets    
Gross carrying amount 0.5 0.5
Government grants | Long-term    
Finite-Lived Intangible Assets    
Gross carrying amount $ 7.0 $ 7.3