Income Taxes (Schedule Of Income Before Income Tax, Domestic And Foreign) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Components of Income before Taxes, Domestic	$ 591.9	$ 573.6	$ 327.6
Components of Income before Taxes, Foreign	37.4	35.9	23.3
Income before Provision for Income Taxes	$ 629.3	$ 609.5	$ 350.9