Inventories - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Inventory Disclosure [Abstract]
Percentage of LIFO inventory	67.00%	93.00%
Inventory, LIFO reserve, effect on income	$ 2.1	$ 0.1	$ 1.5
Effect of LIFO inventory liquidations	$ 1.3