CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net sales	$ 353,300,000	$ 585,400,000
Cost of sales	349,800,000	472,800,000
Gross profit	3,500,000	112,600,000
Selling, general and administrative expenses	42,300,000	52,800,000
Restructuring and asset impairment charges	10,000,000.0	0
Operating (loss) income	(48,800,000)	59,800,000
Interest expense, net	(14,900,000)	(5,400,000)
Other expense, net	(2,300,000)	(300,000)
(Loss) income before income taxes	(66,000,000.0)	54,100,000
Income tax (benefit) expense	(18,900,000)	12,900,000
Net (loss) income	$ (47,100,000)	$ 41,200,000
(LOSS) EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ (0.98)	$ 0.85
Diluted (in dollars per share)	$ (0.98)	$ 0.85
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	48.3	47.9
Diluted (in shares)	48.3	48.3