Share based compensation, additional number of share approved for issuance.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding And Exercisable Intrinsic Value.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding And Exercisable Weighted Average Remaining Contractual Term.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Exercisable Intrinsic Value.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Intrinsic Value

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Intrinsic Value.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Weighted Average Remaining Contractual Term.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Weighted Average Period of Compensation Cost.

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- Definition

Represents the expense recognized 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 64
-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph g(1)

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a

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- Definition

Share-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ 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)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65

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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)

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- Definition

The weighted average fair value at grant for nonvested share-based awards issued 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)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(1)

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- Definition

The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

+ 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)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(b)

+ Details

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- Definition

The total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, 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 Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(2)

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- Definition

The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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

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- Definition

The difference between the maximum number of shares authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares already issued upon exercise of options or other share-based awards under the plan, and 2) shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(2)

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4, 5

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Stock Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Settled Stock Appreciation Rights [Member]	Jun. 30, 2010 Settled Stock Appreciation Rights [Member]	Jun. 30, 2011 Settled Stock Appreciation Rights [Member]	Jun. 30, 2010 Settled Stock Appreciation Rights [Member]	Dec. 31, 2010 Settled Stock Appreciation Rights [Member]	Jun. 30, 2011 Director Restricted Stock Grants [Member]	Jun. 30, 2011 Director Restricted Stock Grants [Member]	Jun. 30, 2011 2006 Plan [Member]	Jun. 30, 2010 2006 Plan [Member]	Jun. 30, 2011 Amendment and Restatement of the 2006 Plan [Member]	Apr. 21, 2011 Amendment and Restatement of the 2006 Plan [Member]
Weighted average grant-date fair value of performance awards granted							$ 22.58	$ 14.51				$ 53.18	$ 33.65
Number of awards granted	1,935,437		1,935,437									624,400		781,500
Number of share approved for issuance	4,300,000		4,300,000									10,000,000		10,000,000
Share based compensation, additional number of share approved for issuance															5,000,000
Stock compensation expense	$ 7.0	$ 3.5	$ 11.7	$ 5.5	$ 0.6	$ 0.6	$ 1.3	$ 1.3		$ 0.9
Weighted average remaining contractual life of SSARs outstanding, in years							5
Total compensation cost not yet recognized							6.0							52.5
Weighted-average period for compensation cost expected to be recognized, in years							3							4
Total fair value of SSARs vested			2.2
Number of shares not vested	448,194		448,194		824,635		824,635		798,197
Total intrinsic value of outstanding SSARs	11.8		11.8
Total intrinsic value of exercisable SSARs			5.8
Total intrinsic value of SSARs exercised			3.4
Restricted stocks granted							150,000				16,560
Restricted common stocks issued											12,034
Outstanding and exercisable options aggregate intrinsic value	0.5		0.5
The total intrinsic value of options exercised			0.2
Cash received from stock option exercises			$ 0.1
Outstanding and exercisable options weighted average remaining contractual life			1