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Operations and Summary of Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Inventory Valuation Reserves $ 165.7 $ 137.2
Inventory, Net [Abstract]    
Finished goods 684.1 589.3
Repair and replacement parts 605.9 532.5
Work in process 178.7 113.8
Raw materials 404.2 279.2
Inventories, net $ 1,872.9 $ 1,514.8