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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[1] | Approximately $15.9 million and $10.9 million of participant cash was withdrawn from our deferred compensation plan investments during the three months ended March 31, 2024 and the year ended December 31, 2023, respectively.

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