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Common Shares (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2015 | Nov. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Number of common and preferred stock authorized to issue |  |  | 185,000,000 |  | 185,000,000 |  |
Common shares, authorized |  |  | 175,000,000 |  | 175,000,000 |  | 175,000,000
Preferred shares, authorized |  |  | 10,000,000 |  | 10,000,000 |  |
Common Stock, Shares, Outstanding |  |  | 86,900,000 |  | 86,900,000 |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  | 0 |  |
2014 ATM program [Member] |  |  |  |  |  |  |
Maximum aggregate offering price of common shares |  | $ 331.3 |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 0 | 0 | 0.0 | 0.0 |
Subsequent Event [Member] | 2014 ATM program [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 0 |  |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale | $ 315.3 |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 500.0 |  | $ 500.0 |  |

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