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Inventories - Schedule of inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Inventory, Net [Abstract]    
Raw materials and supplies $ 200.3 $ 157.5
Work in process 466.9 372.5
Finished and purchased products 193.8 159.2
Total inventory $ 861.0 $ 689.2