CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 387.6	$ 353.3
Cost of sales	362.4	349.8
Gross profit	25.2	3.5
Selling, general and administrative expenses	44.3	42.3
Restructuring and asset impairment charges	0.0	10.0
Operating loss	(19.1)	(48.8)
Interest expense, net	10.2	6.7
Debt extinguishment losses, net	0.0	8.2
Other (income) expense, net	(4.1)	2.3
Loss before income taxes	(25.2)	(66.0)
Income tax benefit	(10.4)	(18.9)
Net loss	$ (14.8)	$ (47.1)
LOSS PER COMMON SHARE:
Basic (in dollars per share)	$ (0.31)	$ (0.98)
Diluted (in dollars per share)	$ (0.31)	$ (0.98)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	48.5	48.3
Diluted (in shares)	48.5	48.3