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Equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Equity [Abstract] |
Common Share Dividends Declared | Common share dividends declared were as follows:
|  | Three-Month Periods Ended September 30, |  |  | Nine-Month Periods Ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Common share dividends declared |  | $ | 0.135 |  |  | $ | 0.12 |  |  | $ | 0.405 |  |  | $ | 0.36 |
Summary of Fair Value of Value Sharing Equity Program Grants | The fair value of the 2013 VSEP grants was estimated on the date of grant using a Monte Carlo approach model based on the following assumptions:
|  | Range |
Risk-free interest rate |  |  | 0.36 | %
Weighted-average dividend yield |  |  | 4.0 | %
Expected life |  |  | 3 years |
Expected volatility |  |  | 18-24 | %

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- Definition Tabular disclosure of all or some of the information related to dividends declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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