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Inventories - Schedule of inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Inventory, Net [Abstract]    
Raw materials and supplies $ 194.3 $ 169.8
Work in process 459.2 425.7
Finished and purchased products 184.1 192.2
Total inventory $ 837.6 $ 787.7