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Stock Compensation - Valuation assumptions used for value of stock compensation granted (Details) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Employee Stock Purchase Plan |  |  |  |
Weighted-average fair value assumptions |  |  |  |
Average risk-free interest rates (as a percent) | 4.87% | 2.92% | 4.27% | 2.77%
Average expected life (in years) | 6 months | 6 months | 6 months | 6 months
Volatility (as a percent) | 27.00% | 39.00% | 23.00% | 28.00%
Weighted-average fair value (in dollars per share) | $ 13.82 | $ 14.91 | $ 14.08 | $ 14.53
Employee Stock Option |  |  |  |
Weighted-average fair value assumptions |  |  |  |
Average risk-free interest rates (as a percent) | 3.88% | 3.04% | 3.76% | 1.67%
Average expected life (in years) | 5 years 6 months 29 days | 5 years 6 months 3 days | 4 years 11 months 12 days | 4 years 9 months 7 days
Volatility (as a percent) | 29.00% | 33.00% | 32.00% | 37.00%
Weighted-average fair value (in dollars per share) | $ 22.57 | $ 26.35 | $ 26.78 | $ 25.30

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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