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Common Shares (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 1 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | May 31, 2012 2012 ATM Program [Member]
Maximum aggregate offering price of common shares |  |  | $ 300
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 |  |
Common Stock, Shares, Outstanding | 86,400,000 |  |
Preferred Stock, Shares Outstanding | 0 |  |

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