Income Taxes (Components of Income from Continuing Operations Before Income Taxes and Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income from continuing operations before income taxes	$ 144.0	$ 521.3	$ 444.8
Current	73.7	77.5	105.9
Deferred	(46.5)	23.8	(23.1)
Total income tax expense	$ 27.2	$ 101.3	$ 82.8