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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 159.2 $ 122.0
Work-in-process 102.0 98.9
Finished goods 248.0 227.7
Total inventories — gross 509.2 448.5
Excess and obsolete inventory reserve (56.1) (47.9)
Net inventories $ 453.1 $ 400.6