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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 261.8 $ 238.5
Work-in-process 74.7 62.9
Raw materials 187.3 177.7
Reserves (33.7) (30.3)
Inventories $ 490.1 $ 448.8