STATEMENTS OF CONSOLIDATED INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net sales	$ 814.1	$ 954.2	$ 1,621.7	$ 1,903.0
Costs and expenses:
Cost of products sold, excluding depreciation and amortization	718.4	898.4	1,449.5	1,764.3
Depreciation and amortization	26.4	27.1	52.7	54.6
Selling, general, administrative, research and development	32.2	27.5	61.9	57.7
Restructuring costs	1.2		2.6
Other operating charges, net		3.2		3.2
Total costs and expenses	778.2	956.2	1,566.7	1,879.8
Operating income (loss)	35.9	(2.0)	55.0	23.2
Other (expense) income:
Interest expense	(12.1)	(12.2)	(24.0)	(24.4)
Other (expense) income, net Note 9	(2.5)	(3.7)	11.1	(5.3)
Income (loss) before income taxes	21.3	(17.9)	42.1	(6.5)
Income tax (provision) benefit	(3.0)	4.1	(7.9)	0.8
Net income (loss)	$ 18.3	$ (13.8)	$ 34.2	$ (5.7)
Net income (loss) per common share:
Basic	$ 1.14	$ (0.87)	$ 2.14	$ (0.36)
Diluted	$ 1.14	$ (0.87)	$ 2.12	$ (0.36)
Weighted-average number of common shares outstanding (in thousands):
Basic	15,974	15,899	15,957	15,883
Diluted	16,083	15,899	16,090	15,883