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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 667.7 $ 589.3
Repair and replacement parts 565.9 532.5
Work in process 192.3 113.8
Raw materials 349.5 279.2
Inventories, net $ 1,775.4 $ 1,514.8