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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Options [Member] | Sep. 30, 2011 Options [Member] | Sep. 30, 2012 Share Awards and Vesting [Member] | Sep. 30, 2011 Share Awards and Vesting [Member] | Sep. 30, 2012 Minimum [Member] Options [Member] | Sep. 30, 2011 Minimum [Member] Options [Member] | Sep. 30, 2012 Maximum [Member] Options [Member] | Sep. 30, 2011 Maximum [Member] Options [Member] | Jun. 30, 2011 2011 Share Incentive Plan [Member] | Sep. 30, 2012 2011 Share Incentive Plan [Member]
Total fungible units to be issued |  |  |  |  |  |  |  |  |  |  |  |  | 9,100,000 | 7,900,000
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 |
Expiration value of option right or other award |  |  |  |  |  |  |  |  |  |  |  |  | 0.83 |
Common shares which could be granted pursuant to full value awards |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000
Options exercised |  |  | 458,881 |  | 500,000 | 500,000 |  |  |  |  |  |  |  |
Exercise price range for options exercised during the period |  |  |  |  |  |  |  |  | $ 30.06 | $ 30.06 | $ 51.37 | $ 62.32 |  |
Total intrinsic value of options exercised during the period |  |  |  |  | $ 12.0 | $ 9.5 |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to unvested options which is expected to be amortized |  |  |  |  | 0.6 |  | 36.9 |  |  |  |  |  |  |
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans |  |  |  |  | 2 years |  | 5 years |  |  |  |  |  |  |
Remaining weighted average contractual life (years) outstanding options |  |  |  |  | 4 years 73 days |  |  |  |  |  |  |  |  |
Remaining weighted average contractual life (years) exercisable options |  |  |  |  | 3 years 73 days |  |  |  |  |  |  |  |  |
Vesting period, years |  |  |  |  |  |  | 5 years |  | 3 years |  | 5 years |  |  |
Options granted in current year |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair value of shares vested |  |  |  |  |  |  | 13.4 | 11.0 |  |  |  |  |  |
Total compensation cost for option and share awards | 3.6 | 3.3 | 10.4 | 9.5 |  |  |  |  |  |  |  |  |  |
Total capitalized compensation cost for option and share awards | $ 0.4 | $ 0.3 | $ 1.1 | $ 0.9 |  |  |  |  |  |  |  |  |  |

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- Definition An option, right, or other award which does not deliver the full value at date of grant and expires five years or less from the date of grant counts against the Fungible Pool Limit as this portion of a fungible pool unit + References No definition available. + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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