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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 88.6 $ 95.3
Raw materials 108.4 76.6
Work in process 20.0 13.1
Total inventories $ 217.0 $ 185.0