CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net sales	$ 690.1	$ 489.0	$ 1,792.1	$ 1,272.6
Cost of sales	596.6	449.5	1,573.9	1,194.8
Gross profit	93.5	39.5	218.2	77.8
Selling, general and administrative expenses	54.2	38.4	148.0	127.3
Operating income (loss)	39.3	1.1	70.2	(49.5)
Interest expense, net	14.5	11.2	40.1	31.5
Other expense (income), net	0.8	(1.8)	6.2	(12.5)
Income (loss) before income taxes	24.0	(8.3)	23.9	(68.5)
Income tax expense (benefit)	5.4	(0.8)	5.9	(16.8)
Net income (loss)	$ 18.6	$ (7.5)	$ 18.0	$ (51.7)
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.38	$ (0.16)	$ 0.36	$ (1.07)
Diluted (in dollars per share)	$ 0.38	$ (0.16)	$ 0.36	$ (1.07)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	48.8	48.6	48.7	48.5
Diluted (in shares)	49.2	48.6	49.0	48.5