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Common Shares (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | May 31, 2012 2012 ATM Program [Member] | Jun. 30, 2014 Employee Stock Option [Member]
Allocated Share-based Compensation Expense | $ 4.2 | $ 3.9 | $ 8.0 | $ 7.3 |  |  | $ 0.3
Maximum aggregate offering price of common shares |  |  |  |  |  | $ 300 |
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 | 85,600,000 |  | 85,600,000 |  |  |  |
Preferred Stock, Shares Outstanding | 0 |  | 0 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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