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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished and semi-finished $ 1,019.6 $ 1,053.4
Raw materials 400.4 494.2
Total cost 1,420.0 1,547.6
Adjustment to state inventories at LIFO value (278.8) (375.5)
Inventory, net $ 1,141.2 $ 1,172.1