Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Stock-Based Compensation
Stock-based compensation expense (in dollars)	$ 4.9	$ 3.3
Stock Options \| Directors
Stock-Based Compensation
Expiration period (in years)	ten years
Stock Options \| Officers and Employees
Stock-Based Compensation
Number of share options granted during the period (in shares)	1.0	1.4
Expiration period (in years)	ten years
Vesting rights, annual increments for grants made prior to 2011 (as a percent)	25.00%
Vesting period for grants made prior to 2011 ( in years)	four year
Expiration period for grants made prior to 2011 (in years)	ten years
Vesting rights, annual increments beginning on the grant date (as a percent)	25%
Vesting period (in years)	four years
Restricted Stock
Stock-Based Compensation
Expiration period (in years)	3 years
Number of restricted shares issued during the period (in shares)	0.8	0.5
Performance shares
Stock-Based Compensation
Number of restricted shares issued during the period (in shares)	0.8	0.5
Performance shares \| Officers and Employees
Stock-Based Compensation
Awards granted, low end of range (in shares)	0
Awards granted, high end of range (in shares)	0.9
Percentage of vesting rights on the second anniversary of the grant date (as a percent)	75.00%
Percentage of vesting rights on the third anniversary of the grant date (as a percent)	25.00%

The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways for grants made prior to the specified date.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways for grants made prior to the specified date.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale for grants made prior to the specified date.

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- Definition

Represents the high end of the range of the number of grants made during the period on other than stock (or unit) option plans.

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- Definition

Represents the low end of the range of the number of grants made during the period on other than stock (or unit) option plans.

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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
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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph g(1)
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-Name Accounting Standards Codification
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
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-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.

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- Definition

The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a
-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.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph A240
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
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-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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Net number of share options (or share units) granted during the period.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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-Name Regulation S-X (SX)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-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.

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