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This element represents the aggregate fair value of the restricted stock forfeited during the reporting period.

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No definition available.

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This element represents the aggregate fair value of the restricted stock granted during the reporting period.

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No definition available.

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This element represents the aggregate fair value of the restricted stock at the balance sheet date.

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No definition available.

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This element represents the percentage of the stock-based award which will vest at the end of year one.

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No definition available.

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This element represents the percentage of the stock-based award which will vest at the end of year two.

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No definition available.

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- Definition

The weighted average fair value at grant date for equity-based awards issued and vested 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).

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No definition available.

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The percentage of the stock options which will vest at the end of year one.

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No definition available.

+ Details

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The percentage of the stock options which will vest at the end of year two.

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Represents the payout percentage based upon the performance during the performance period.

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No definition available.

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Represents the percentage of unitholder return realized on common units from the date of grant.

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No definition available.

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The stated exercise price for purposes of disclosing shares potentially issuable under outstanding stock option awards on stock option plans.

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No definition available.

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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.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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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 as a result of the occurrence of a terminating event.

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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).

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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).

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

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

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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.

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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.

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- Definition

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

+ 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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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.

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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

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the 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.

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

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- Definition

Net number of non-option equity instruments granted to participants.

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Number of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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.

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

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

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

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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Share-Based Compensation Plans (Details 2) (USD $)	12 Months Ended
Share-Based Compensation Plans (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Performance awards
Non-Vested Shares
Shares granted, number	146,490
Assumptions used in the Black-Scholes single option pricing model
Volatility factor (as a percent)	38.00%
Phantom units
Non-Vested Shares
Shares granted, number	4,780
2012 Executive Performance Incentive Plan
Share-Based Compensation Plans
Unrecognized compensation costs on non-vested awards	$ 25,500,000
Non-Vested Shares
Shares granted, number	377,250
Non-vested shares, Forfeited	(25,770)
Shares Outstanding, End of Period	351,480
Aggregate Fair Value
Weighted Average Fair Value of shares, Granted (in dollars per share)	$ 108.85
Assumptions used in the Black-Scholes single option pricing model
Risk-free interest rate (as a percent)	0.36%
Expected term	3 years
Non-qualified Stock Options, Aggregate Intrinsic Value
Unrecognized compensation costs on non-vested awards, weighted average period of recognition	2 years
2012 Executive Performance Incentive Plan \| Minimum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	0.00%
2012 Executive Performance Incentive Plan \| Maximum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	300.00%
2010 Stock Incentive Award program
Non-Vested Shares
Shares Outstanding, Beginning of Period	295,635
Shares granted, number	294,925
Non-vested shares, Vested	(294,925)
Restricted Stock, Aggregate Fair Value
Aggregate Fair Value of shares, Vested	(12,600,000)
2011 Value Driver Performance Program
Non-Vested Shares
Shares Outstanding, End of Period		523,347
Non-qualified Stock Options, Aggregate Intrinsic Value
Award vested at end of year one, percentage	50.00%
Award vested at end of year two, percentage	50.00%
2012 Value Driver Performance Program
Share-Based Compensation Plans
Unrecognized compensation costs on non-vested awards	5,700,000
Non-Vested Shares
Shares Outstanding, End of Period	409,357
Aggregate Fair Value
Weighted Average Fair Value of shares, Granted (in dollars per share)	$ 54.79
Non-qualified Stock Options, Aggregate Intrinsic Value
Award vested at end of year one, percentage	50.00%
Award vested at end of year two, percentage	50.00%
2011 Volume and Efficiency Program
Share-Based Compensation Plans
Unrecognized compensation costs on non-vested awards	8,200,000
Non-Vested Shares
Shares Outstanding, Beginning of Period	244,780
Shares Outstanding, End of Period	228,640
Aggregate Fair Value
Weighted Average Fair Value of shares, Granted (in dollars per share)	$ 48.06
2011 Volume and Efficiency Program \| Minimum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	0.00%
2011 Volume and Efficiency Program \| Maximum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	300.00%
Restricted Stock Awards
Share-Based Compensation Plans
Period after which the shares granted will be fully vested	3 years	3 years	3 years
Unrecognized compensation costs on non-vested awards	5,300,000
Non-Vested Shares
Shares Outstanding, Beginning of Period	180,950
Shares granted, number	103,730	65,390	85,720
Non-vested shares, Vested	(46,452)
Non-vested shares, Forfeited	(34,110)
Shares Outstanding, End of Period	204,118	180,950
Aggregate Fair Value
Weighted Average Fair Value, Beginning of Period (in dollars per share)	$ 43.10
Weighted Average Fair Value of shares, Granted (in dollars per share)	$ 53.50	$ 52	$ 43
Weighted Average Fair Value of shares, Vested (in dollars per share)	$ 34.31
Weighted Average Fair Value of shares, Forfeited (in dollars per share)	$ 46.25
Weighted Average Fair Value, End of Period (in dollars per share)	$ 49.86	$ 43.10
Restricted Stock, Aggregate Fair Value
Aggregate Fair Value, Beginning of Period	7,798,194
Aggregate Fair Value of shares, Granted	5,550,057
Aggregate Fair Value of shares, Vested	(1,593,612)	(5,100,000)	(2,900,000)
Aggregate Fair Value of shares, Forfeited	(1,577,709)
Aggregate Fair Value, End of Period	10,176,930	7,798,194
Non-qualified Stock Options, Aggregate Intrinsic Value
Unrecognized compensation costs on non-vested awards, weighted average period of recognition	18 months
Non-employee Directors' Share-Based Awards
Share-Based Compensation Plans
Non-employee Directors' share-based awards outstanding	153,861
Non-employee Directors' share-based awards granted	28,140	22,140	28,348
Non-employee Directors' weighted average fair value of shares, Granted (in dollars per share)	$ 53.47	$ 44.84	$ 38.74
Performance awards
Share-Based Compensation Plans
Unrecognized compensation costs on non-vested awards	2,500,000
Non-Vested Shares
Shares Outstanding, End of Period	146,490
Aggregate Fair Value
Weighted Average Fair Value of shares, Granted (in dollars per share)	$ 20.02
Non-qualified Stock Options, Aggregate Intrinsic Value
Unrecognized compensation costs on non-vested awards, weighted average period of recognition	3 years
Performance awards \| Minimum
Non-Vested Shares
Percentage of unitholder return realized on common units from the date of grant	10.00%
Assumptions used in the Black-Scholes single option pricing model
Volatility factor (as a percent)	27.00%
Performance awards \| Maximum
Assumptions used in the Black-Scholes single option pricing model
Volatility factor (as a percent)	72.00%
2013 Value Driver Award Program
Non-Vested Shares
Shares granted, number	270,030
Non-qualified Stock Options, Aggregate Intrinsic Value
Award vested at end of year one, percentage	50.00%
Award vested at end of year two, percentage	50.00%
2013 Value Driver Award Program \| Minimum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	0.00%
2013 Value Driver Award Program \| Maximum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	300.00%
2013 Executive Performance Incentive Plan
Share-Based Compensation Plans
Period after which the shares granted will be fully vested	3 years
Non-Vested Shares
Shares granted, number	307,250
2013 Executive Performance Incentive Plan \| Minimum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	0.00%
2013 Executive Performance Incentive Plan \| Maximum
Non-qualified Stock Options, Aggregate Intrinsic Value
Compensation plan, award as a percentage of target award level	300.00%
Non-Qualified Stock Options
Share-Based Compensation Plans
Unrecognized compensation costs on non-vested awards	1,800,000
Assumptions used in the Black-Scholes single option pricing model
Risk-free interest rate (as a percent)	0.89%	2.02%
Dividend yield (as a percent)	1.64%	2.19%
Volatility factor (as a percent)	31.00%	29.00%	32.00%
Expected term	5 years	5 years	5 years
Grants in period (in shares)	278,300	229,100	409,100
Non-Qualified Stock Options, weighted average grant date fair value (in dollars per share)	$ 13.19	$ 10.06	$ 9.31
Non-Qualified Stock Options, total intrinsic value of options exercised	11,800,000	18,300,000	7,500,000
Non-qualified Stock Options, Shares
Non-qualified Stock Options Outstanding, Beginning of Period (in shares)	1,946,787
Non-qualified Stock Options, Granted (in shares)	278,300	229,100	409,100
Non-qualified Stock Options, Exercised (in shares)	(325,035)
Non-qualified Stock Options, Forfeited (in shares)	(46,577)
Non-qualified Stock Options Outstanding, End of Period (in shares)	1,853,475	1,946,787
Non-qualified Stock Options Exercisable, End of Period (in shares)	1,460,625
Non-qualified Stock Options, Weighted Average Exercise Price
Weighted Average Exercise Price, Beginning of Period (in dollars per share)	$ 40.51
Weighted Average Exercise Price of shares, Granted (in dollars per share)	$ 54.79
Weighted Average Exercise Price of shares, Exercised (in dollars per share)	$ 20.70
Weighted Average Exercise Price of shares, Forfeited (in dollars per share)	$ 45.93
Weighted Average Exercise Price, End of Period (in dollars per share)	$ 45.99	$ 40.51
Weighted Average Exercise Price of shares, Exercisable (in dollars per share)	$ 44.41
Non-Qualified Stock Options, Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term, End of Period	4 years
Weighted Average Remaining Contractual Term, Exercisable	2 years 10 months 24 days
Non-qualified Stock Options, Aggregate Intrinsic Value
Aggregate Intrinsic Value Outstanding, End of Period	22,291,945
Aggregate Intrinsic Value Exercisable, End of Period	$ 19,883,267
2013 Stock Options
Term of stock options	4 years
Non-Qualified Stock Options \| Minimum
Assumptions used in the Black-Scholes single option pricing model
Risk-free interest rate (as a percent)			1.60%
Dividend yield (as a percent)			2.10%
Non-Qualified Stock Options \| Maximum
Assumptions used in the Black-Scholes single option pricing model
Risk-free interest rate (as a percent)			2.50%
Dividend yield (as a percent)			2.34%
2013 Stock Options
Non-Qualified Stock Options, Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term, End of Period	10 years
Non-qualified Stock Options, Aggregate Intrinsic Value
Exercise price of awards (in dollars per share)	$ 58.98
2013 Stock Options
Term of stock options	10 years
Exercise price of stock options (in dollars per share)	$ 58.98
Stock options vested at end of year one, percentage	50.00%
Stock options vested at end of year two, percentage	50.00%