Discontinued Operations - Schedule of Financial Results from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 27.6	$ 1.4	$ 32.6	$ 6.5
Engineered Materials | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	59.1	33.6	113.0	84.6
Cost of sales	46.7	26.9	89.7	65.9
Selling, general and administrative	4.7	4.2	9.2	9.4
Restructuring charges	0.0	0.6	0.0	0.6
Income from discontinued operations	7.7	1.9	14.1	8.7
Income tax (benefit) provision	(19.9)	0.5	(18.5)	2.2
Income from discontinued operations, net of tax	27.6	$ 1.4	32.6	$ 6.5
Deferred tax benefit	$ 21.5		$ 21.5