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Reconciliation of Federal Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Taxes computed at the federal rate	$ 2.2	$ (311.2)	$ 49.7
Goodwill	2.6	50.4	0.0
State and local income taxes, net of federal tax benefit	0.4	(0.2)	0.3
Valuation allowance	17.6	335.5	(89.1)
Repatriation of foreign earnings (GILTI )	2.0	0.2	3.5
Restructuring	0.0	0.0	4.2
Recognition of stranded deferred tax balance	3.9	0.0	0.0
Foreign earnings taxed at different rate	3.0	1.7	2.7
Withholding taxes	3.4	2.1	2.7
Preferential tax rate	(6.2)	(4.6)	(4.1)
Other	(2.1)	3.8	1.6
Income tax provision (benefit)	$ 26.8	$ 77.7	$ (28.5)

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