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Stock-Based Compensation (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2020 $ / shares shares
Stock Options And SOSARs [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares granted | 112,000
Granted, weighted-average exercise price | $ / shares | $ 859.20
Stock option exercises (shares) | 438,000
Units forfeited | 25,000
Weighted-average grant date fair value | $ / shares | $ 227.08
Stock Options And SOSARs [Member] | Vesting Period 1 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 2 years
Stock Options And SOSARs [Member] | Vesting Period 2 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Restricted Stock Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares granted | 42,000
Units forfeited | 9,000
Weighted-average grant date fair value | $ / shares | $ 904.87
Units released | 58,000
Restricted Stock Units [Member] | Vesting Period 1 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 2 years
Restricted Stock Units [Member] | Vesting Period 2 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Units vested | 71,000
Units forfeited | 2,000
Performance shares granted | 27,000
Weighted-average grant date fair value | $ / shares | $ 853.03
Performance and market measurement period | 3 years
Performance Shares [Member] | Defined Minimum Targets Not Met [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Units vested | 0
Minimum [Member] | Performance Shares [Member] | Vesting Period 1 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting percentage | 0.00%
Maximum [Member] | Performance Shares [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of target number of shares to be earned if certain criteria is met | 100.00%
Maximum [Member] | Performance Shares [Member] | Vesting Period 1 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting percentage | 300.00%

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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