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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Share based compensation expense | $ 26.0 | $ 24.1 | $ 48.0 | $ 44.2
Share based compensation expense, net of tax | 19.7 | 18.3 | $ 36.4 | 33.5
Percentage Of Awards Applied To Performance Condition |  |  | 50.00% |
Percentage of Awards Applied to Market Condition |  |  | 50.00% |
Stock options and Restricted Stock Units (RSUs) [Member] |  |  |  |
Vesting period, in years |  |  | 3 years |
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share based compensation expense | $ 5.4 | $ 4.8 | $ 10.7 | $ 8.9
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  | 101,742 | 98,948
Weighted average fair value per award, in dollars per share |  |  | $ 359.33 | $ 276.15
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  | 241,763 | 249,579
Weighted average fair value per award, in dollars per share |  |  | $ 101.73 | $ 76.85
Phantom Share Units (PSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  | 134,740 | 161,030
Weighted average fair value per award, in dollars per share |  |  | $ 374.20 | $ 332.17

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- Definition Percentage of performance share awards upon which the performance condition was applied as laid out in the 2012 revisions to the company's incentive compensation agreement + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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