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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 89.5 $ 95.3
Raw materials 93.7 76.6
Work in process 20.7 13.1
Total inventories $ 203.9 $ 185.0