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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 27.3 $ 23.3
Work-in-process 57.2 40.3
Finished goods 40.4 37.4
Total inventories $ 124.9 $ 101.0