Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Deferred compensation plan investments	$ 137.3	[1]	$ 129.8
Participant Withdrawals From Deferred Compensation Plan Investments	10.6		37.8
Level 1 [Member]
Deferred compensation plan investments	137.3		129.8
Level 2 [Member]
Deferred compensation plan investments	0.0		0.0
Level 3 [Member]
Deferred compensation plan investments	$ 0.0		$ 0.0

[1] Approximately $10.6 million and $37.8 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2021 and 2020, respectively.