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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 848.9 $ 684.1
Repair and replacement parts 652.2 605.9
Work in process 277.9 178.7
Raw materials 504.3 404.2
Inventories, net $ 2,283.3 $ 1,872.9