Number of common stock trading days.

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- Definition

Number of stock based compensation plans.

+ References

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- Definition

Period of Time to Measure Company Total Shareholder Return and Apply Vesting Payout Cap

+ References

No definition available.

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- Definition

Share-based Compensation Arragement by Share-based Payment Award, Equity Instruments Other than Options, Payout Potential Range

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payout Potential Cap

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Expiration Term

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- Definition

Share based compensation arrangement by share based payment award options exercisable rate.

+ References

No definition available.

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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

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

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- Definition

Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified share-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) increases (decreases) net cash provided by financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11374-113907

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

-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 Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

No definition available.

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Stock-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Plan	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans	2
Vesting payout cap	100.00%
Period of time to measure Company total shareholder return and apply vesting payout cap	3 years
Options expiration term	6 years
Weighted-average fair value of options granted during period	$ 15.07	$ 13.36	$ 9.44
Total fair value of shares vested during period	$ 7,300,000	$ 6,000,000	$ 4,000,000
Total intrinsic value of options exercised	14,800,000	24,900,000	14,100,000
Cash received from options exercised	13,056,000	23,232,000	22,375,000
Tax benefit/(shortfall) realized for tax deductions from option exercises and vesting of restricted stock	3,603,000	6,097,000	3,290,000
Aggregate intrinsic value of exercisable options	15,600,000	20,800,000	21,000,000
Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized for restricted stock awards	8,300,000	8,100,000	7,200,000
Restricted Stock And Restricted Stock Units [Member] \| Options Exercisable After First Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	25.00%
Restricted Stock And Restricted Stock Units [Member] \| Options Exercisable After Second Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	50.00%
Restricted Stock And Restricted Stock Units [Member] \| Options Exercisable After Third Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	75.00%
Restricted Stock And Restricted Stock Units [Member] \| Options Exercisable After Fourth Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	100.00%
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock trading days	10 days
Cash received from options exercised	$ 18,700,000	$ 30,800,000	$ 26,400,000
Stock Incentive Plan [Member] \| Options Exercisable After First Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	25.00%
Stock Incentive Plan [Member] \| Options Exercisable After Second Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	50.00%
Stock Incentive Plan [Member] \| Options Exercisable After Third Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	75.00%
Stock Incentive Plan [Member] \| Options Exercisable After Fourth Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	100.00%
Stock Incentive Plan [Member] \| Prior To January 29, 2007 [Member] \| Options Exercisable After First Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	50.00%
Stock Incentive Plan [Member] \| Prior To January 29, 2007 [Member] \| Options Exercisable After Second Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	75.00%
Stock Incentive Plan [Member] \| Prior To January 29, 2007 [Member] \| Options Exercisable After Third Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	100.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting payout potential range	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting payout potential range	175.00%