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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024		Dec. 31, 2023
Deferred compensation plan investments (1)	$ 125.7	[1]	$ 132.0
Participant Withdrawals From Deferred Compensation Plan Investments	15.9		10.9
Level 1 [Member]
Deferred compensation plan investments (1)	125.7	[1]	132.0
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
Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Liability at Fair Value	0.0		0.7
Interest Rate Swap [Member] | Level 1 [Member]
Interest Rate Cash Flow Hedge Liability at Fair Value	0.0		0.0
Interest Rate Swap [Member] | Level 2 [Member]
Interest Rate Cash Flow Hedge Liability at Fair Value	0.0		0.7
Interest Rate Swap [Member] | Level 3 [Member]
Interest Rate Cash Flow Hedge Liability at Fair Value	0.0		0.0
Fair Value Hedging
Hedged Asset, Fair Value Hedge	3.8		11.6
Fair Value Hedging | Level 1 [Member]
Hedged Asset, Fair Value Hedge	0.0		0.0
Fair Value Hedging | Level 2 [Member]
Hedged Asset, Fair Value Hedge	3.8		11.6
Fair Value Hedging | Level 3 [Member]
Hedged Asset, Fair Value Hedge	$ 0.0		$ 0.0
[1] Approximately $15.9 million and $10.9 million of participant cash was withdrawn from our deferred compensation plan investments during the three months ended March 31, 2024 and the year ended December 31, 2023, respectively.

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