Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021
Deferred compensation plan investments	$ 120.7	[1]	$ 137.3
Participant Withdrawals From Deferred Compensation Plan Investments	3.6		10.6
Level 1 [Member]
Deferred compensation plan investments	120.7		137.3
Level 2 [Member]
Deferred compensation plan investments	0.0		0.0
Level 3 [Member]
Deferred compensation plan investments	$ 0.0		$ 0.0

[1] Approximately $3.6 million and $10.6 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2022 and 2021, respectively.