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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($) d $ / shares shares | Mar. 31, 2022 $ / shares shares
Restricted Stock And Restricted Stock Unit (RSU) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | 271,614 | 112,324
Restricted Stock And Restricted Stock Unit (RSU) | Board of Directors |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting periods | 1 year |
Restricted Stock And Restricted Stock Unit (RSU) | Chief Executive Officer |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting periods | 8 years |
Market-based Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | 167,606 | 100,193
Trading days | d | 20 |
Trading days, lookback | d | 30 |
Weighted-average grant-date fair values of restricted stock awards granted (in usd per share) | $ / shares | $ 70.07 | $ 87.11
Weighted-average period to recognize compensation cost (in years) | 2 years 7 months 6 days |
Restricted Stock, Restricted Stock Unit (RSU), Market-based Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost related to non-vested awards granted | $ | $ 66.2 |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) | 439,220 |
Weighted-average period to recognize compensation cost (in years) | 4 years 2 months 12 days |
Minimum | Restricted Stock And Restricted Stock Unit (RSU) | Senior Staff |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting periods | 4 years |
Minimum | Market-based Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted-average grant-date fair values of restricted stock awards granted (in usd per share) | $ / shares | $ 83.61 | 107.97
Maximum | Restricted Stock And Restricted Stock Unit (RSU) | Senior Staff |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting periods | 5 years |
Maximum | Market-based Restricted Stock Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted-average grant-date fair values of restricted stock awards granted (in usd per share) | $ / shares | $ 103.76 | $ 138.73
2015 Stock Option Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum issuance of common stock (in shares) | 4,200,000 |
Number of options outstanding (in shares) | 435,135 |
2015 Stock Option Plan | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Market value of common stock on the date of grant for incentive stock options | 100.00% |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for 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 (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options. + 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 (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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