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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventories:    
Finished goods $ 371.1 $ 350.0
Work in process 255.1 275.4
Raw materials, supplies and other 347.1 335.6
First-in, first-out inventory 973.3 961.0
Less: Excess of first-in, first-out cost over last-in, first-out cost (155.9) (160.8)
Net inventories $ 817.4 $ 800.2