Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded

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- Definition

Payout Percentage for Exceeding Performance Target

+ References

No definition available.

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- Definition

Performance Period

+ References

No definition available.

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- Definition

Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Tax Benefits

+ References

No definition available.

+ Details

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- Details

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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- Definition

Equity-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 Accounting Standards Codification

-Topic 505

-SubTopic 50

-Section 50

-Paragraph 1

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-Name Accounting Standards Codification

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-Paragraph 2

-Subparagraph (h)(1)

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64, 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-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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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

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- Definition

The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

+ References

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit 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)

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)

-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 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)

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit 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 or units.

+ 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)

-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 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)

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

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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

+ Details

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

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- Definition

The maximum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References

No definition available.

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- Definition

The minimum period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References

No definition available.

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

+ Details

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

+ Details

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

+ Details

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

+ Details

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

+ Details

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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

+ Details

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- Definition

The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

+ References

+ Details

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

+ Details

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- Definition

The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

+ References

+ Details

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- Definition

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

+ References

+ Details

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- Definition

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

+ References

+ Details

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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

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

+ References

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ 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 (c)(1)(i)-(ii)

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

+ Details

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- Definition

The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-SubTopic 10

-Topic 718

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

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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 that are exercisable.

+ References

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- Definition

The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ References

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- Definition

As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

+ References

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- Definition

The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options that are exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

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- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of share options (or share units) exercised during the current period.

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Long-term Equity-based Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended													3 Months Ended						1 Months Ended	36 Months Ended	3 Months Ended
	Mar. 31, 2012 years	Mar. 31, 2011	Dec. 31, 2011	Mar. 31, 2012 Range of Exercise Prices $10.00 - $15.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $15.01 - $20.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $20.01 - $25.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $25.01 - $30.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $30.01 - $35.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $35.01 - $40.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $40.01 - $45.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $45.01 - $50.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $50.01 - $55.00 [Member] years	Mar. 31, 2012 Range of Exercise Prices $10.00 - $50.00 [Member] years	Mar. 31, 2012 Time-Based Restricted Stock [Member]	Mar. 31, 2011 Time-Based Restricted Stock [Member]	Dec. 31, 2011 Time-Based Restricted Stock [Member]	Mar. 31, 2012 Restricted Stock [Member]	Mar. 31, 2012 Performance-Based Restricted Stock [Member]	Dec. 31, 2011 Performance-Based Restricted Stock [Member]	Mar. 31, 2012 Performance-Based Restricted Stock [Member] Performance Period, 2010 to 2012 [Member]	Mar. 31, 2012 Performance-Based Restricted Stock [Member] Performance Period, 2011 to 2013 [Member]	Mar. 31, 2012 Performance-Based Restricted Stock [Member] Performance Period, 2012 to 2014 [Member]	Jan. 31, 2012 Performance-Based Restricted Stock [Member] Performance Period, 2009 to 2011 [Member]	Dec. 31, 2011 Performance-Based Restricted Stock [Member] Performance Period, 2009 to 2011 [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2011 Stock Options [Member]	Mar. 31, 2012 Stock Options [Member] Employee [Member] years	Mar. 31, 2011 Stock Options [Member] Employee [Member] years	Mar. 31, 2012 Stock Options [Member] Maximum [Member]	Mar. 31, 2011 Stock Options [Member] Maximum [Member]	Mar. 31, 2012 Stock Options [Member] Minimum [Member]	Mar. 31, 2011 Stock Options [Member] Minimum [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	9,322,399
Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded																		566,400
Share-based Compensation Expense	$ 1.5	$ 1.3
Unamortized Compensation Expense Related to Nonvested Awards	9.1
Share-based Compensation, Not yet Recognized, Period for Recognition (in years)	1.5
Expected Volatility, Minimum																									29.36%	41.34%
Expected Volatility, Maximum																									53.84%	55.16%
Risk-free Interest Rate, Minimum																									0.16%	1.30%
Risk-free Interest Rate, Maximum																									1.26%	2.87%
Expected Dividend Yield																													3.26%	3.38%	3.17%	3.38%
Weighted-Average Expected Life, Minimum (in years)																											1.0	3.5
Weighted-Average Expected Life, Maximum (in years)																											7.0	7.0
Outstanding, Shares Subject to Options (in shares)	3,835,099		3,632,398	204,500	8,000	313,750	612,949	2,614	341,577	489,363	1,369,021	493,325	3,835,099
Outstanding, Weighted Average Exercise Price Per Share (in dollars per share)	$ 40.07		$ 40.70	$ 13.55	$ 16.48	$ 23.74	$ 28.45	$ 31.18	$ 37.25	$ 43.33	$ 48.68	$ 51.12	$ 40.07
Options, Granted (in shares)	229,451
Options, Granted, Weighted Average Exercise Price (in dollars per share)	$ 29.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	6,250
Options, Exercised, Weighted Average Exercise Price (in dollars per share)	$ 17.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	20,500
Options, Forfeited or Expired in Period, Weighted Average Exercise Price (in dollars per share)	$ 43.64
Outstanding, Weighted Average Remaining Contractual Life (in years)	4.33			6.85	7.10	8.02	8.61	0.85	5.70	1.92	2.82	1.25	4.33
Options, Outstanding, Aggregate Intrinsic Value	6.7
Options, Vested and Expected to Vest, Outstanding, Number (in shares)	3,790,666
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 40.22
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Life (in years)	4.28
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	6.6
Options, Vested and Expected to Vest, Exercised, Number (in shares)	3,119,209
Options, Vested and Expected to Vest, Exercised, Weighted Average Exercise Price (in dollars per share)	$ 43.20
Options, Vested and Expected to Vest, Exercised, Weighted Average Remaining Contractual Life (in years)	3.30
Options, Vested and Expected to Vest, Exercised, Aggregate Intrinsic Value	3.9
Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 9.39	$ 9.06
Options, Exercised in Period, Total Intrinsic Value	0.1	0.1
Range of Exercise Prices, Minimum, (in dollars per share)				$ 10.00	$ 15.01	$ 20.01	$ 25.01	$ 30.01	$ 35.01	$ 40.01	$ 45.01	$ 50.01	$ 10.00
Range of Exercise Prices, Maximum, (in dollars per share)				$ 15.00	$ 20.00	$ 25.00	$ 30.00	$ 35.00	$ 40.00	$ 45.00	$ 50.00	$ 55.00	$ 55.00
Exercisable, Shares Subject to Options (in shares)				152,249	8,000	118,875	144,636	2,163	341,577	489,363	1,369,021	493,325	3,119,209
Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 13.55	$ 16.48	$ 23.63	$ 26.82	$ 31.34	$ 37.25	$ 43.33	$ 48.68	$ 51.12	$ 43.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number														155,538		116,784		188,800	172,875
Nonvested Restricted Stock, Granted (in shares)														57,625				68,575
Nonvested Restricted Stock, Granted, Weighted Average Grant Date Fair Value (in dollars per share)														$ 29.71				$ 36.65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period														6,500				51,596
Nonvested Restricted Stock, Vested, Weighted Average Grant Date Fair Value (in dollars per share)														$ 25.12				$ 14.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period														12,371				1,054
Nonvested Restricted Stock, Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)														$ 25.74				$ 26.79
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value														$ 25.43		$ 23.33		$ 36.67	$ 29.86
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded																		188,800		56,500	63,725	68,575
Payout Percentage for Exceeding Performance Target																								183.00%
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures																							40,727
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value															0		2.8
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation																	$ 1.0
Performance Period																		3 years