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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury (Tables) | 12 Months Ended
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Dec. 31, 2017
Common Shares [Member] |
Redeemable Noncontrolling Interest [Line Items] |
Common Share Dividends Declared | Common share dividends declared were as follows:
|  | For the Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Common share dividends declared per share |  | $ | 0.76 |  |  | $ | 0.76 |  |  | $ | 0.69 |

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