CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 396.0	$ 348.8	$ 783.6	$ 702.1
Cost of sales	382.9	342.8	745.3	692.6
Gross profit	13.1	6.0	38.3	9.5
Selling, general and administrative expenses	44.6	42.2	88.9	84.5
Restructuring and asset impairment charges	0.0	0.0	0.0	10.0
Goodwill impairment	0.0	52.8	0.0	52.8
Operating loss	(31.5)	(89.0)	(50.6)	(137.8)
Interest expense, net	10.1	7.9	20.3	14.6
Debt extinguishment losses, net	0.0	0.0	0.0	8.2
Other (income) expense, net	(6.6)	(1.3)	(10.7)	1.1
Loss before income taxes	(35.0)	(95.6)	(60.2)	(161.7)
Income tax benefit	(5.6)	(10.7)	(16.1)	(29.7)
Net loss	$ (29.4)	$ (84.9)	$ (44.1)	$ (132.0)
LOSS PER COMMON SHARE:
Basic (in dollars per share)	$ (0.61)	$ (1.76)	$ (0.91)	$ (2.74)
Diluted (in dollars per share)	$ (0.61)	$ (1.76)	$ (0.91)	$ (2.74)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	48.6	48.3	48.5	48.3
Diluted (in shares)	48.6	48.3	48.5	48.3