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Stock-Based Compensation Plans (Details 4) - Performance awards - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Maximum Measurement Period | 3 years |  |
Performance awards |  |  |
Outstanding at the beginning of the period (in shares) | 253,432 | 267,129 | 251,770
Granted (in shares) | 77,182 | 80,512 | 100,965
Increase (decrease) in awards based on performance (in shares) | 18,112 | (16,760) | 5,990
Converted to restricted stock (in shares) | (96,317) | (73,072) | (88,477)
Forfeited (in shares) | (10,488) | (4,377) | (3,119)
Outstanding at the ending of the period (in shares) | 241,921 | 253,432 | 267,129
Weighted average grant date fair value per award |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 176.27 | $ 157.21 | $ 155.25
Granted (in dollars per share) | 238.03 | 200.75 | 155.31
Change in awards based on performance (in dollars per share) | 177.26 | 142.03 | 148.79
Converted to restricted stock (in dollars per share) | 177.26 | 142.03 | 148.79
Forfeited (in dollars per share) | 188.52 | 166.44 | 160.33
Outstanding at the ending of the period (in dollars per share) | $ 195.13 | $ 176.27 | $ 157.21
Grants in period based on shareholder metrics (in shares) | 38,823 | 47,502 | 62,043
Grants in period based on financial metrics (in shares) | 38,359 | 33,010 | 38,922

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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 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. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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://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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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