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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Deferred compensation plan investments (1) | $ 142.3 | [1] | $ 144.7
Participant Withdrawals From Deferred Compensation Plan Investments | 19.0 |  | 12.7
Interest Rate Derivative Liabilities, at Fair Value | 0.0 |  | 7.4
Level 1 [Member] |  |  |
Deferred compensation plan investments (1) | 142.3 | [1] | 144.7
Interest Rate Derivative Liabilities, at Fair Value | 0.0 |  | 0.0
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 Derivative Liabilities, at Fair Value | 0.0 |  | 0.0
Interest Rate Swap [Member] |  |  |
Interest Rate Derivative Assets, at Fair Value | 0.0 |  | 0.0
Interest Rate Derivative Liabilities, at Fair Value | 0.0 |  | 7.4
Interest Rate Swap [Member] | Level 2 [Member] |  |  |
Interest Rate Derivative Liabilities, at Fair Value | $ 0.0 |  | $ 7.4
[1] | Approximately $19.0 million and $12.7 million of participant cash was withdrawn from our deferred compensation plan investments during the six months ended June 30, 2019 and the year ended December 31, 2018, respectively.

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