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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2011 | Jun. 30, 2010
Stock options granted | 0.7 | 0.9
Unvested shares granted | 0.2 | 0.3
Capitalized compensation cost | $ 0.1 |
Stock Options [Member] |  |
Total unrecognized compensation cost | 13.6 |
Weighted-average period of total unrecognized compensation cost, in years | 1.5 |
Unvested Shares [Member] |  |
Total unrecognized compensation cost | $ 12.0 |
Weighted-average period of total unrecognized compensation cost, in years | 1.2 |

X
- Definition Represents the compensation cost capitalized during the period arising from share-based compensation arrangements (for example, shares of stock, 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) + Details
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- Definition As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h + Details
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- Definition The weighted average period over which unrecognized share-based compensation costs are expected to be reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h + Details
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- Definition The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) + Details
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- Definition The quantity of shares issuable on stock options awarded under the plan during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) + Details
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