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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 773.4 $ 684.1
Repair and replacement parts 601.2 605.9
Work in process 250.9 178.7
Raw materials 476.3 404.2
Inventories, net $ 2,101.8 $ 1,872.9