Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred tax liability adjustment due to tax act	$ 4.4	$ 5.6		$ 8.6
Increase (decrease) in unrecognized tax benefits	(0.3)
Unrecognized tax benefits that would impact effective tax rate	6.2
Interest and penalty expense, excluding refunds	0.3	0.2	$ (0.1)
Accrued interest and penalty	$ 3.3	$ 3.1