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Stock Compensation - Valuation assumptions used for value of stock compensation granted (Details) - $ / shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Employee Stock |  |  |  |
Weighted-average fair value assumptions |  |  |  |
Average risk-free interest rates (as a percent) | 4.22% | 0.28% | 3.44% | 0.22%
Average expected life (in years) | 6 months | 6 months | 6 months | 6 months
Volatility (as a percent) | 31.00% | 25.00% | 27.00% | 31.00%
Weighted-average fair value (in dollars per share) | $ 16.46 | $ 18.20 | $ 15.38 | $ 18.82
Share-based Payment Arrangement, Option |  |  |  |
Weighted-average fair value assumptions |  |  |  |
Average risk-free interest rates (as a percent) | 2.90% | 0.76% | 2.03% | 0.60%
Average expected life (in years) | 5 years 2 months 1 day | 5 years 1 month 28 days | 4 years 10 months 17 days | 5 years
Volatility (as a percent) | 35.00% | 38.00% | 36.00% | 39.00%
Weighted-average fair value (in dollars per share) | $ 27.57 | $ 28.84 | $ 25.96 | $ 29.32

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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