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Common Shares (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 1 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | May 31, 2012 2012 ATM Program [Member] | May 31, 2011 2010 and 2011 ATM Programs [Member] | Sep. 30, 2013 Line of Credit [Member]
Maximum aggregate offering price of common shares |  |  | $ 300 | $ 300 |
Amount of current borrowing capacity under unsecured credit facility |  |  |  |  | $ 500
Number of common and preferred stock authorized to issue | 185,000,000 |  |  |  |
Common shares, authorized | 175,000,000 | 175,000,000 |  |  |
Preferred shares, authorized | 10,000,000 |  |  |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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 210.5-02.29) -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 30 -Article 5 + Details
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