Stock-Based Plans (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Restricted Stock
Stock Plans
Share-based compensation arrangement by share-based payment award, restricted stock units and restricted shares (in shares)	453,185	366,033
Share-based compensation arrangement by share-based payment award, restricted stock units and restricted shares, weighted-average per share price (in dollars per share)	$ 61.43	$ 62.50
Restricted Stock for Stock Based Compensation Company Executives
Stock Plans
Share-based compensation arrangement by share-based payment award, award vesting period	3 years	3 years
Stock Options
Stock Plans
Share-based compensation arrangement by share-based payment award, award vesting period	3 years	3 years
Share-based compensation arrangement by share-based payment award, options awarded (in shares)	884,574	641,817
Share-based compensation arrangement by share-based payment award, options, weighted average grant date fair value (in dollars per share)	$ 61.45	$ 62.50
Share-based compensation arrangement by share-based payment award, award expiration period	10 years	10 years
Performance-based VDI units
Stock Plans
Share-based compensation arrangement by share-based payment award, restricted stock units and restricted shares (in shares)	385,742	329,289
Share-based compensation arrangement by share-based payment award, restricted stock units and restricted shares, weighted-average per share price (in dollars per share)	$ 61.45	$ 62.50
Share-based compensation arrangement by share-based payment award, award vesting period	3 years

The period of time in which the equity-based award expires.

No definition available.

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- Details

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- Definition

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.

+ 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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

-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 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 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.

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

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

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

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