Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Amounts Reclassified from AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Amount reclassified from AOCI
Cost of sales	$ 2,213.0	$ 1,686.5	$ 1,470.4
Interest expense	54.1	44.9	32.7
Other expense (income), net	(6.5)	12.7	(8.4)
Income (expense) benefit	(16.1)	14.0	68.3
Net income (loss)	56.4	(49.1)	$ (229.6)
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes	7.7	28.7
Income (expense) benefit	(1.9)	(6.9)
Net income (loss)	5.8	21.8
Cash flow hedging items | Amount Reclassified from AOCI | Commodity contracts
Amount reclassified from AOCI
Cost of sales	7.7	28.3
Cash flow hedging items | Amount Reclassified from AOCI | Forward interest rate swaps
Amount reclassified from AOCI
Interest expense	0.0	0.4
Net actuarial loss, net | Amount Reclassified from AOCI
Amount reclassified from AOCI
Other expense (income), net	(7.7)	(7.6)
Prior service benefit, net | Amount Reclassified from AOCI
Amount reclassified from AOCI
Other expense (income), net	1.8	1.8
Pension and other postretirement benefit plan items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes	(5.9)	(5.8)
Income (expense) benefit	1.4	1.3
Net income (loss)	$ (4.5)	$ (4.5)