Share Based Compensation Arrangement by Share Based Payment Award Options Vested in Period total intrinsic value.

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- Definition

Share based compensation.

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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

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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

The number of shares issued pursuant to the terms of the deferred compensation plan as of the balance sheet date.

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- Definition

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 example, in years, month and year).

+ References

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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

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-Subparagraph c(2)

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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

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

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- Definition

As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

+ 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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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ 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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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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Share Based Compensation (Details Textuals) (USD $) In Millions, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share Based Compensation (Textuals) [Abstract]
Share Based Compensation expense	$ 9.0	$ 3.6	$ 17.2	$ 10.6
Aggregate value of restricted stock awards at date of grant	29.3	10.6	29.3	10.6
Total intrinsic value of stock option exercised			15.8	4.0
Total fair value of option vested during the period			5.2	5.6
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of Restricted Stock Awarded to Employees and Directors that vested			$ 18.6	$ 23.0
Employees and Director [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted Stock Awarded to Employees and Directors			1,049,540	475,667
Restricted stock awards granted to directors [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period of shares			Up to 4 Years
Common shares purchased			755,166	27,907