Discontinued Operations - Schedule of Financial Results from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 5.2	$ 7.2	$ 37.8	$ 13.9
Engineered Materials | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	60.3	48.3	173.3	132.9
Cost of sales	47.2	35.2	137.0	101.1
Selling, general and administrative	6.5	4.1	15.6	13.5
Restructuring charges	0.0	0.0	0.0	0.6
Income from discontinued operations	6.6	9.0	20.7	17.7
Income tax (benefit) provision	1.4	1.8	(17.1)	3.8
Income from discontinued operations, net of tax	5.2	$ 7.2	37.8	$ 13.9
Deferred tax benefit	$ 21.5		$ 21.5