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Inventories - Schedule of inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Inventory, Net [Abstract]    
Raw materials and supplies $ 170.2 $ 157.5
Work in process 414.4 372.5
Finished and purchased products 155.9 159.2
Total inventory $ 740.5 $ 689.2