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Inventories - Schedule of inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jun. 30, 2017
Inventory, Net [Abstract]    
Raw materials and supplies $ 168.7 $ 152.8
Work in process 379.4 365.6
Finished and purchased products 184.5 172.0
Total inventory $ 732.6 $ 690.4