Discontinued Operations - Schedule of Loss from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (1.7)	$ 2.4
Disposal Group, Held-for-sale, Not Discontinued Operations | Aluminum Products Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	46.9	60.6
Cost of sales	45.5	53.8
Selling, general and administrative	3.1	3.7
Restructuring and other special charges	0.0	0.5
Operating (loss) income	(1.7)	2.6
Interest expense	(0.7)	(0.7)
(Loss) income from operation of discontinued operations	(2.4)	1.9
Income tax benefit	0.7	0.5
(Loss) income from discontinued operations, net of tax	(1.7)	2.4
Interest expense allocated	$ 0.6	$ 0.6