Schedule of Changes in Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits classified within deferred taxes as a reduction of net operating loss carryforwards	$ 7.8	$ 12.3	$ 13.0
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Decreases in prior period tax positions	(3.3)	0.0	0.0
Increases in current period tax positions	0.0	0.3	2.7
Unrecognized tax benefits	9.1	14.2	15.2	$ 14.4
Expiration of the statute of limitations	(1.8)	(1.3)	(1.9)
Ending balance	9.1	14.2	$ 15.2
Income tax penalties and interest accrued	1.4	$ 1.9
Unrecognized tax benefits that would impact effective tax rate	1.0
Unrecognized tax benefits that will be recognized within 12 months of year end	$ 1.4