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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]      
Finished goods $ 454.3 $ 431.1 $ 537.2
Work in process 152.8 165.7 151.6
Raw materials 199.8 198.2 209.9
Total inventories $ 806.9 $ 795.0 $ 898.7