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Inventories - Schedule of inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Inventory, Net [Abstract]    
Raw materials and supplies $ 174.4 $ 217.6
Work in process 244.3 312.3
Finished and purchased products 146.4 194.4
Total inventories $ 565.1 $ 724.3