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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Deferred compensation plan investments (1) | $ 132.9 | [1] |  | $ 129.8
Participant Withdrawals From Deferred Compensation Plan Investments | 9.4 |  | $ 37.8 |
Level 1 [Member] |  |  |  |
Deferred compensation plan investments (1) | 132.9 | [1] |  | 129.8
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[1] | Approximately $9.4 million and $37.8 million of participant cash was withdrawn from our deferred compensation plan investments during the six months ended June 30, 2021 and the year ended December 31, 2020, respectively.

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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