CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales	$ 624.2	$ 579.1	$ 1,276.1	$ 1,102.0
Cost of sales	501.6	509.1	1,029.4	977.2
Gross profit	122.6	70.0	246.7	124.8
Selling, general and administrative expenses	52.8	47.4	107.9	93.9
Operating income	69.8	22.6	138.8	30.9
Interest expense, net	13.0	13.0	25.7	25.6
Other expense, net	1.6	1.9	5.5	5.4
Income (loss) before income taxes	55.2	7.7	107.6	(0.1)
Income tax expense	12.5	1.5	21.0	0.5
Net income (loss)	$ 42.7	$ 6.2	$ 86.6	$ (0.6)
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.86	$ 0.13	$ 1.75	$ (0.02)
Diluted (in dollars per share)	$ 0.85	$ 0.13	$ 1.73	$ (0.02)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	49.7	48.8	49.4	48.7
Diluted (in shares)	50.2	49.0	50.0	48.7