Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax asset
Tax loss, credit and interest carryforwards	$ 256.4	$ 259.2
Goodwill and intangibles	0.0	12.0
Compensation and employee benefits	65.0	90.4
Accruals and other reserves	42.2	18.0
Research and development capitalization	16.4	19.4
Equity investment and other securities	29.6	33.4
Leases	42.9	42.5
Other	1.8	5.9
Total deferred tax assets	454.3	480.8
Less: valuation allowance	(210.9)	(208.1)
Total deferred tax assets, net of valuation allowance	243.4	272.7
Deferred tax liabilities
Goodwill and intangibles	(70.1)	0.0
Property, plant and equipment	(148.5)	(156.0)
Unremitted earnings	(10.6)	(7.1)
Accounts Receivable & Other Assets	(7.4)	0.0
Total deferred tax liabilities	(236.6)	(163.1)
Net deferred tax asset	6.8	109.6
Deferred Tax Assets, Net, Classification [Abstract]
Non-current assets	181.5	223.6
Non-current liability	(174.7)	(114.0)
Net deferred tax asset	$ 6.8	$ 109.6