Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021	Dec. 31, 2021
Deferred compensation plan investments (1)	$ 111.1	[1]		$ 137.3
Participant Withdrawals From Deferred Compensation Plan Investments	3.3		$ 10.6
Level 1 [Member]
Deferred compensation plan investments (1)	111.1	[1]		137.3
Level 2 [Member]
Deferred compensation plan investments (1)	0.0	[1]		0.0
Level 3 [Member]
Deferred compensation plan investments (1)	$ 0.0	[1]		$ 0.0

[1] Approximately $3.3 million and $10.6 million of participant cash was withdrawn from our deferred compensation plan investments during the nine months ended September 30, 2022 and the year ended December 31, 2021, respectively.