Equity and Cash Incentive Program (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Maximum number of restricted stock and performance shares available for issuance	2,000,000
Additional Disclosures [Abstract]
Cash received for the exercise of stock options	$ 38,029	$ 26,519	$ 66,962
Tax benefit from the exercise of stock options	22,771	8,752	6,466
Performance Shares Unvested [Roll Forward]
Performance Shares Unvested (in number of shares)	95,167	113,197
Performance Shares Granted (in number of shares)	50,416	44,751	68,446
Performance Shares Vested (in number of shares)	(68,446)
Performance Shares Unvested, Weighted Average Grant Date Fair Value [Roll Forward]
Performance Shares Unvested, Weighted Average Grant Date Fair Value	$ 81.12	$ 57.23
Performance Shares Vested, Weighted Average Grant Date Fair Value	$ 57.49
Unrecognized Compensation Cost [Abstract]
Restricted stock granted	0	55,200	15,500
Vesting period (in years)	3 years
Award term	10 years
Stock-based compensation expense [Abstract]
Pre-tax compensation expense	30,884	25,130	20,407
Tax benefit	(10,904)	(8,795)	(7,142)
Total stock-based compensation expense, net of tax	19,980	16,335	13,265
Shares Granted to Directors [Abstract]
Aggregate shares granted	20,344	20,929	20,853
Shares withheld to satisfy tax obligations	(544)	(562)	(574)
Net shares granted	19,800	20,367	20,279
Stock Appreciation Rights (SARs) [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate (in hundredths)	1.05%	2.68%	2.77%
Dividend yield (in hundredths)	2.03%	1.70%	2.33%
Expected life (in years)	5 years 8 months	5 years 10 months	6 years
Volatility (in hundredths)	36.41%	33.56%	31.93%
Fair value on date of grant	$ 18.51	$ 20.13	$ 11.66
Awards Outstanding [Roll Forward]
Awards Outstanding (in number of shares)	8,551,608	9,393,634
Awards Granted (in number of shares)	1,719,943	1,524,329	2,304,574
Awards Forfeited and Expired (in number of shares)	(194,943)
Awards Exercised (in number of shares)	(2,367,026)
Awards Exercisable (in number of shares)	3,431,600
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Awards Outstanding, Weighted Average Exercise Price	$ 50.17	$ 44.14
Awards Granted, Weighted Average Exercise Price	$ 65.38	$ 66.59	$ 42.88
Awards Forfeited and Expired, Weighted Average Exercise Price	$ 55.25
Awards Exercised, Weighted Average Exercise Price	$ 36.84
Awards Exercisable, Weighted Average Exercise Price	$ 40.29
Additional Disclosures [Abstract]
Awards Exercised, Total Intrinsic Value	61,531	24,322	1,083
Awards Outstanding, Intrinsic Value	134,097
Awards Outstanding, Weighted Average Remaining Contractual Term	6 years 5 months
Awards Exercisable, Intrinsic Value	87,227
Awards Exercisable, Weighted Average Remaining Contractual Term	4 years 4 months
Fair value of stock appreciation rights which became exerciable during the year	16,484	21,202	23,593
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	27,722
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)	0.37%	1.34%	1.37%
Dividend yield (in hundredths)	2.03%	1.61%	2.38%
Expected life (in years)	2 years 11 months	2 years 11 months	2 years 11 months
Volatility (in hundredths)	34.10%	40.48%	39.98%
Fair value on date of grant	$ 71.98	$ 91.41	$ 57.49
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Expense	3,525
Unrecognized Compensation Expense, Period for Recognition	1 year 7 months
Stock Options [Member]
Awards Outstanding [Roll Forward]
Awards Outstanding (in number of shares)	724,406	1,943,094
Awards Granted (in number of shares)	0
Awards Forfeited and Expired (in number of shares)	(14,122)
Awards Exercised (in number of shares)	(1,204,566)
Awards Exercisable (in number of shares)	724,406
Awards Outstanding, Weighted Average Exercise Price [Roll Forward]
Awards Outstanding, Weighted Average Exercise Price	$ 38.18	$ 36.96
Awards Granted, Weighted Average Exercise Price	$ 0
Awards Forfeited and Expired, Weighted Average Exercise Price	$ 37.93
Awards Exercised, Weighted Average Exercise Price	$ 36.21
Awards Exercisable, Weighted Average Exercise Price	$ 38.18
Additional Disclosures [Abstract]
Awards Exercised, Total Intrinsic Value	29,866	24,726	28,699
Awards Outstanding, Intrinsic Value	19,941
Awards Outstanding, Weighted Average Remaining Contractual Term	1 year 6 months
Awards Exercisable, Intrinsic Value	19,941
Awards Exercisable, Weighted Average Remaining Contractual Term	1 year 6 months
2005 Equity and Cash Incentive Plan [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	20,000,000
2012 Equity and Cash Incentive Plan [Member]
Awards Granted, Fair Value Assumptions and Methodology [Abstract]
Shares available for grant	17,000,000
Additional Paid-in Capital [Member]
Additional Disclosures [Abstract]
Tax benefit from the exercise of stock options	$ 22,771	$ 8,752	$ 6,466

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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).

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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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Balance Type:	na
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- 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

+ 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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Period Type:	duration

- 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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Period Type:	duration

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

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

+ 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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

+ Details

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- Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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- Details

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Namespace Prefix:	us-gaap_
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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

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4, 5

-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 AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-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 505

-SubTopic 10

-Section 50

-Paragraph 2

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

Reference 4: 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

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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 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

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