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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 66.3 $ 51.8
Work-in-process 119.1 103.2
Finished goods 46.6 50.8
Total inventories $ 232.0 $ 205.8