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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Approximately $19.0 million and $12.7 million of participant cash was withdrawn from our deferred compensation plan investments during the six months ended June 30, 2019 and the year ended December 31, 2018, respectively.