Discontinued Operations - Schedule of Loss from Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (24.3)	$ (25.9)	$ (4.3)
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	210.4	161.0	143.1
Cost of sales	220.0	169.3	135.7
Selling, general and administrative	14.2	11.5	10.2
Restructuring and other special charges	3.9	4.0	0.0
Goodwill impairment	0.0	4.6	0.0
Operating loss	(27.7)	(28.4)	(2.8)
Interest expense	(2.8)	(3.0)	(2.7)
Loss from operation of discontinued operations	(30.5)	(31.4)	(5.5)
Loss on classification as held-for-sale	(1.8)	0.0	0.0
Income tax benefit	8.0	5.5	1.2
Loss from discontinued operations, net of tax	(24.3)	(25.9)	(4.3)
Interest expense allocated	$ 2.5	$ 2.6	$ 2.3