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Fair Value Disclosures (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012
Deferred compensation plan investments | $ 37.8 | [1] | $ 35.0
Participant Withdrawals From Deferred Compensation Plan Investments | 0.9 |  |
Level 1 [Member] |  |  |
Deferred compensation plan investments | 37.8 | [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[1] | Approximately $0.9 million of participant cash was withdrawn from our deferred compensation plan investments during the three months ended March 31, 2013.

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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