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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 USD ($) | Jun. 30, 2011 shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 USD ($) shares
Options exercised during the period |  |  |  | 109,936 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 13,000 |  |  | 12,854 |
Total compensation cost for option and share awards | $ | $ 5.2 | $ 4.8 |  | $ 10.9 | $ 8.9
Total capitalized compensation cost for option and share awards | $ | 1.0 | $ 0.9 |  | 1.9 | $ 1.7
Employee Stock Option [Member] |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  | $ 0.1 |
Options exercised during the period |  |  |  | 100,000 | 100,000
Total intrinsic value of options exercised during the period | $ |  |  |  | $ 4.7 | $ 2.0
Remaining weighted average contractual life (years) outstanding options |  |  |  | 2 years 8 months 12 days |
Remaining weighted average contractual life (years) exercisable options |  |  |  | 2 years 8 months 12 days |
Share Awards and Vesting [Member] |  |  |  |  |
Total unrecognized compensation cost which is expected to be amortized | $ | $ 37.7 |  |  | $ 37.7 |
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans |  |  |  | 3 years |
Fair value of shares vested | $ |  |  |  | $ 22.5 | $ 18.1
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00% |
Minimum [Member] | Share Awards and Vesting [Member] |  |  |  |  |
Vesting period, years |  |  |  | 3 years |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 33.33% |
Maximum [Member] | Share Awards and Vesting [Member] |  |  |  |  |
Vesting period, years |  |  |  | 5 years |
2011 Share Incentive Plan [Member] |  |  |  |  |
Total fungible units available | 3,700,000 |  | 9,100,000 | 3,700,000 |
Units available under the 2011 Share Plan |  |  | 5,800,000 |  |
Fungible units transferred from the 2002 Share Plan to the 2011 Share Plan |  |  | 3,300,000 |  |
Fungible Units To Full Value Award Conversion Ratio |  |  | 3.45 |  |
Full Value award in the fungible unit conversion ratio |  |  | 1.0 |  |
Value of option right or other award in the fungible unit conversion |  |  | 0.83 |  |
Common shares which could be granted pursuant to full value awards | 1,100,000 |  |  | 1,100,000 |

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- Definition Shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable, specifically for the 2011 Share Plan, which superseded the 2002 Share Plan. + References No definition available. + Details
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- Definition Shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable, specifically from the 2002 Share Plan, which has been superseded by the 2011 Share Plan. + References No definition available. + Details
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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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