Discontinued Operations - Schedule of Major Classes of Assets and Liabilities from Discontinued Operations (Details) - Engineered Materials - Discontinued Operations, Held-for-sale - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets:
Accounts receivable, net	$ 17.1	$ 8.8
Inventories, net	9.4	8.5
Other current assets	0.5	0.1
Property, plant and equipment, net	26.1	26.8
Other assets	0.3	0.6
Intangible assets, net	1.2	1.2
Goodwill	171.3	171.3
Assets held for sale	225.9	217.3
Liabilities:
Accounts payable	25.1	19.5
Accrued liabilities	8.1	7.9
Long-term deferred tax liability	4.7	26.1
Other liabilities	0.0	0.1
Liabilities held for sale	$ 37.9	$ 53.6