Income Taxes (Summary of Income Tax Uncertainties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Liability at beginning of year, net	$ 2.2	$ 2.0	$ 0.9
Additions for tax positions of current year		0.2	2.0
Subtractions as a result of a lapse of the applicable statute of limitations	(0.9)		(0.9)
Liability at end of year, net	$ 1.3	$ 2.2	$ 2.0