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Supplementary Financial Statement Information (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished and semi-finished $ 823.0 $ 996.5
Raw materials 343.9 410.0
Total cost 1,166.9 1,406.5
Adjustment to state inventories at LIFO value (188.6) (180.2)
Inventory, net $ 978.3 $ 1,226.3