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Other Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Schedule of Shares Purchased in the Open Market For Employees | Shares purchased in the open market for employees for the years ended December 31, 2018, 2019, and 2020 were as follows:
| Shares purchased |  | Average price per share
2018 | 4,647 |  |  | $ | 100.34 |
2019 | 4,918 |  |  | $ | 126.83 |
2020 | 7,274 |  |  | $ | 112.65 |

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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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