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Common Shares (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
2010 ATM Program [Member] |
Activity Under Share Offering Program [Line Items] |
Activity Under At-The-Market Share Offering Program |
|  |  | September 30, |  |  |  | September 30, |
|  | Year Ended December 31, |
| 2011 |  |  | 2010 |
Total net consideration |  | $ | 13,847.0 |  |  | $ | 231,650.5 |
Common shares sold |  |  | 252.5 |  |  |  | 4,867.7 |
Average price per share |  | $ | 55.81 |  |  | $ | 48.37 |
2011 ATM Program [Member] |
Activity Under Share Offering Program [Line Items] |
Activity Under At-The-Market Share Offering Program |
|  |  | September 30, |
|  | Year Ended December 31, 2011 |
Total net consideration |  | $ | 92,723.6 |
Common shares sold |  |  | 1,498.5 |
Average price per share |  | $ | 62.98 |

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