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Debt And Credit Agreements (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Apr. 23, 2012
Line of Credit Facility [Line Items] |  |
Line of credit facility, covenant terms, maximum debt to EBITDA ratio | 3.0 |
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio | 2.5 |
Line of credit facility, covenant terms, maximum aggregate distributions | $ 100 |
Line of credit facility, covenant terms, percentage of distributions to net income | 50.00% |
Line of credit facility, covenant terms, minimum shareholders' equity | 320 |
Line of credit facility, covenant terms, percentage of shareholders' equity to net income | 50.00% |
Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 350 |
Line of credit facility, term | 5 years |
Line of credit facility, option to increase additional amount | 75 |
Amount borrowed under the Credit Agreement |  | 102
Previous Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 300 |
Line of credit facility, term | 4 years |

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- Definition Line Of Credit Facility Additional Borrowing Capacity + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility, covenant terms, maximum aggregate dividends. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, maximum debt to EBITDA ratio. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, minimum shareholders' equity. + References No definition available. + Details
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Balance Type: | credit
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- Definition Line of credit facility, covenant terms, percentage of dividends to net income. + References No definition available. + Details
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- Definition Line of credit facility, covenant terms, percentage of shareholders' equity to net income. + References No definition available. + Details
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- Definition Line of credit facility term. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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Balance Type: | na
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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