Income Taxes - Reconciliation of the U.S. Federal Statutory Income Tax Rate to the Company's Effective Income Tax Rate for Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. federal income tax at statutory rate	$ 3.6	$ (0.4)	$ 12.4
U.S. state income tax provision	0.3	1.9	(0.1)
Manufacturing and research incentives	(0.2)	(0.8)	(3.0)
Taxes on non-U.S. income which differ from the U.S. statutory rate	1.5		(2.6)
Adjustments for unrecognized tax benefits	(2.3)	10.7	(1.3)
Adjustments for valuation allowances	4.5	22.2	4.5
U.S. tax reform	(1.6)	(14.6)	4.0
Other items	0.3	(1.9)	(1.5)
Income tax provision (benefit)	$ 6.1	$ 17.1	$ 12.4