CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net sales	$ 2,759.7	$ 2,550.3	$ 1,836.3
Cost of sales	2,175.4	2,213.0	1,686.5
Gross profit	584.3	337.3	149.8
Selling, general and administrative expenses	230.2	204.2	174.7
Goodwill impairment charge	14.1	0.0	0.0
Restructuring and asset impairment charges	16.9	0.0	0.0
Operating income (loss)	323.1	133.1	(24.9)
Interest expense, net	51.0	54.1	44.9
Debt extinguishment losses, net	0.0	(0.0)	6.0
Other expense (income), net	60.5	6.5	(12.7)
Income (loss) before income taxes	211.6	72.5	(63.1)
Income tax expense (benefit)	25.1	16.1	(14.0)
Net income (loss)	$ 186.5	$ 56.4	$ (49.1)
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 3.75	$ 1.15	$ (1.01)
Diluted (in dollars per share)	$ 3.70	$ 1.14	$ (1.01)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	49.7	48.8	48.5
Diluted (in shares)	50.3	49.2	48.5