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Supplementary Financial Statement Information - Inventory (Details3) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished and semi-finished $ 996.7 $ 842.3
Raw materials 388.3 390.3
Inventory, net $ 1,385.0 $ 1,232.6