Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016		Dec. 31, 2015
Deferred compensation plan investments (1)	$ 48.5	[1]	$ 53.6
Participant Withdrawals From Deferred Compensation Plan Investments	7.1		8.4
Level 1 [Member]
Deferred compensation plan investments (1)	48.5	[1]	53.6
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[1] Approximately $7.1 million and $8.4 million of participant cash was withdrawn from our deferred compensation plan investments during the three months ended March 31, 2016 and the year ended December 31, 2015, respectively.