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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]      
Finished goods $ 340.1   $ 156.0
Work in process 28.5   0.5
Raw materials and supplies 148.9   49.3
Total inventory, net $ 517.5 $ 466.9 $ 205.8