STATEMENTS OF CONSOLIDATED (LOSS) INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 741.0	$ 275.7	$ 1,065.0	$ 645.0
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	673.3	224.5	935.8	511.1
Depreciation and amortization	25.8	13.0	39.3	26.2
Selling, general, administrative, research and development	30.9	22.7	62.7	46.6
Restructuring (benefit) costs	(0.1)	11.9	(0.8)	11.9
Other operating loss (income), net		(1.1)		(1.1)
Total costs and expenses	729.9	271.0	1,037.0	594.7
Operating income	11.1	4.7	28.0	50.3
Other (expense) income:
Interest expense	(12.4)	(10.5)	(24.7)	(16.6)
Other (expense) income, net – Note 11	(36.6)	0.5	(37.0)	(0.3)
(Loss) income before income taxes	(37.9)	(5.3)	(33.7)	33.4
Income tax benefit (provision)	15.5	(1.3)	15.8	(10.9)
Net (loss) income	$ (22.4)	$ (6.6)	$ (17.9)	$ 22.5
Net (loss) income per common share:
Basic	$ (1.42)	$ (0.41)	$ (1.13)	$ 1.42
Diluted	$ (1.42)	$ (0.41)	$ (1.13)	$ 1.41
Weighted-average number of common shares outstanding (in thousands):
Basic	15,835	15,781	15,820	15,809
Diluted	15,835	15,781	15,820	15,929