Inventories - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Inventory Disclosure [Abstract]
Inventory LIFO reserve	$ 427.2	$ 238.8
Current cost of LIFO inventory	800.4	557.0
Cost of sales	0.0	52.2	$ 1.8
LIFO decrement		$ 37.3
Earnings per share, diluted (in dollars per share)		$ 0.77
Inventory adjustment	$ 0.0	$ 4.2	$ 29.3