Equity and Cash Incentive Program (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	17,000,000
Vesting period (in years)	3 years
Award term	10 years
Additional Disclosures [Abstract]
Cash received for the exercise of stock options	$ 14,830	$ 38,029	$ 26,519
Tax benefit from the exercise of stock options	25,661	22,771	8,752
Stock-based compensation expense [Abstract]
Pre-tax compensation expense	30,480	30,884	25,130
Tax benefit	(10,745)	(10,904)	(8,795)
Total stock-based compensation expense, net of tax	19,735	19,980	16,335
Shares Granted to Directors [Abstract]
Aggregate shares granted	14,271	20,344	20,929
Shares deferred	(6,929)	0	0
Shares withheld to satisfy tax obligations	(354)	(544)	(562)
Net shares granted	6,988	19,800	20,367
Stock Appreciation Rights (SARs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate (in hundredths)	1.39%	1.05%	2.68%
Dividend yield (in hundredths)	2.06%	2.03%	1.70%
Expected life (in years)	7 years 1 month	5 years 8 months	5 years 10 months
Volatility (in hundredths)	33.78%	36.41%	33.56%
Fair value on date of grant	$ 20.62	$ 18.51	$ 20.13
Awards Outstanding [Roll Forward]
Awards Outstanding (in number of shares)	7,520,760	8,551,608
Awards Granted (in number of shares)	1,613,884	1,719,943	1,524,329
Awards Forfeited and Expired (in number of shares)	(285,351)
Awards Exercised (in number of shares)	(2,359,381)
Awards Exercisable (in number of shares)	3,089,841
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Awards Outstanding, Weighted Average Exercise Price	$ 56.67	$ 50.17
Awards Granted, Weighted Average Exercise Price	$ 71.86	$ 65.38	$ 66.59
Awards Forfeited and Expired, Weighted Average Exercise Price	$ 66.72
Awards Exercised, Weighted Average Exercise Price	$ 42.28
Awards Exercisable, Weighted Average Exercise Price	$ 40.47
Additional Disclosures [Abstract]
Awards Exercised, Total Intrinsic Value	83,944	61,531	24,322
Awards Outstanding, Intrinsic Value	299,812
Awards Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months
Awards Exercisable, Intrinsic Value	173,243
Awards Exercisable, Weighted Average Remaining Contractual Term	4 years 9 months
Fair value of stock appreciation rights which became exerciable during the year	23,605	16,484	21,202
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	30,018
Unrecognized Compensation Expense, Period for Recognition	1 year 8 months
Performance Shares [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate (in hundredths)	0.40%	0.37%	1.34%
Dividend yield (in hundredths)	2.06%	2.03%	1.61%
Expected life (in years)	2 years 11 months	2 years 11 months	2 years 11 months
Volatility (in hundredths)	30.36%	34.10%	40.48%
Fair value on date of grant	$ 80.47	$ 71.98	$ 91.41
Awards Outstanding [Roll Forward]
Awards Forfeited and Expired (in number of shares)	(7,156)
Performance Shares Unvested [Roll Forward]
Awards Unvested (in number of shares)	92,545	95,167
Awards Granted (in number of shares)	47,032	50,416	44,751
Awards Vested (in number of shares)	(42,498)
Performance Shares Unvested, Weighted Average Grant Date Fair Value [Roll Forward]
Awards Unvested, Weighted Average Grant Date Fair Value	$ 76.05	$ 81.12
Awards Vested, Weighted Average Grant Date Fair Value	$ 91.41
Awards Forfeited, Weighted Average Grant Date Fair Value	$ 81.19
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	3,524
Unrecognized Compensation Expense, Period for Recognition	1 year 7 months
Stock Options [Member]
Awards Outstanding [Roll Forward]
Awards Outstanding (in number of shares)	209,827	724,406
Awards Granted (in number of shares)	0
Awards Forfeited and Expired (in number of shares)	(22,438)
Awards Exercised (in number of shares)	(492,141)
Awards Exercisable (in number of shares)	209,827
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Awards Outstanding, Weighted Average Exercise Price	$ 38.39	$ 38.18
Awards Granted, Weighted Average Exercise Price	$ 0
Awards Forfeited and Expired, Weighted Average Exercise Price	$ 30.50
Awards Exercised, Weighted Average Exercise Price	$ 38.44
Awards Exercisable, Weighted Average Exercise Price	$ 38.39
Additional Disclosures [Abstract]
Awards Exercised, Total Intrinsic Value	19,937	29,866	24,726
Awards Outstanding, Intrinsic Value	12,201
Awards Outstanding, Weighted Average Remaining Contractual Term	1 year 0 months
Awards Exercisable, Intrinsic Value	12,201
Awards Exercisable, Weighted Average Remaining Contractual Term	1 year 0 months
Restricted Stock [Member]
Performance Shares Unvested [Roll Forward]
Awards Unvested (in number of shares)	40,000
Awards Granted (in number of shares)	0		55,200
Performance Shares Unvested, Weighted Average Grant Date Fair Value [Roll Forward]
Awards Unvested, Weighted Average Grant Date Fair Value	$ 66.59
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	1,125
Unrecognized Compensation Expense, Period for Recognition	2 years 1 month
Additional Paid-in Capital [Member]
Additional Disclosures [Abstract]
Tax benefit from the exercise of stock options	$ 25,661	$ 22,771	$ 8,752

Common stock issued to directors, net of tax obligations.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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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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-Subparagraph (c)(1)(iii)

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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

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)(iii)

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- Definition

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.

+ References

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ 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 (d)(2)

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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

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)(iv)(3)-(4)

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

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- Definition

Weighted average price of options that were either forfeited or expired.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-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

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- Definition

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

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

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- Definition

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.

+ 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 (e)(1)

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- Definition

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

+ References

No definition available.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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- Definition

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

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-Section S99

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-Subparagraph (SX 210.3-04)

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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-SubTopic 10

-Section 50

-Paragraph 2

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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