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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 781.2 $ 684.1
Repair and replacement parts 611.4 605.9
Work in process 264.1 178.7
Raw materials 475.2 404.2
Inventories, net $ 2,131.9 $ 1,872.9