Fair Value Disclosures (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Deferred compensation plan investments	$ 40.8	[1]	$ 35.0
Participant Withdrawals From Deferred Compensation Plan Investments	1.2
Level 1 [Member]
Deferred compensation plan investments	40.8	[1]	35.0
Level 2 [Member]
Deferred compensation plan investments	0	[1]	0
Level 3 [Member]
Deferred compensation plan investments	$ 0	[1]	$ 0

[1] Approximately $1.2 million of participant cash was withdrawn from our deferred compensation plan investments during the nine months ended September 30, 2013.