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Goodwill and Intangible Assets - Government Grants (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets    
Gross carrying amount $ 505.3 $ 505.7
Government grants    
Finite-Lived Intangible Assets    
Gross carrying amount 7.4 7.7
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 $ 6.9 $ 7.2