v2.4.0.8

Stock-Based Plans (Details) (USD $) | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Restricted stock units and restricted shares | Executives and directors |  |
Stock Plans |  |
Share-based compensation arrangement by share-based payment award, restricted stock units and restricted shares (in shares) | 477,731 | 450,668
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 | $ 61.70
Restricted stock units | Executives |  |
Stock Plans |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years | 3 years
Restricted shares | Executives |  |
Stock Plans |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years | 3 years
Stock Options | Executives |  |
Stock Plans |  |
Share-based compensation arrangement by share-based payment award, options awarded (in shares) | 884,574 | 688,380
Share-based compensation arrangement by share-based payment award, options awarded weighted average exercise price (in dollars per share) | $ 61.45 | $ 62.18
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, award expiration period | 10 years | 10 years
Performance-based VDI units | Executives |  |
Stock Plans |  |
Share-based compensation arrangement by share-based payment award, restricted stock units and restricted shares (in shares) | 385,742 | 341,104
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 | $ 62.29
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |

X
- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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 + 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 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + Details
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