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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Total number of shares authorized by the shareholders | 23,000,000.0 |  |
Remains available for future incentive awards | 10,500,000 |  |
Share-based compensation expense | $ (85.5) | $ (67.1) | $ (55.7)
Share-based compensation expense, net of tax | (64.8) | (50.8) | (42.2)
Aggregate intrinsic value of options exercised, in USD | $ 210.2 | 159.8 |
Percentage Of Awards Applied To Performance Condition | 50.00% |  |
Percentage of Awards Applied to Market Condition | 50.00% |  |
Stock options and RSUs [Member] |  |  |
Vesting period, in years | 3 years |  |
Stock Option [Member] |  |  |
Total unrecognized compensation cost from stock option arrangements granted under the plan, in USD | $ 12.3 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based compensation expense | (27.3) | $ (23.5) | $ (19.7)
Total unrecognized compensation cost from stock option arrangements granted under the plan, in USD | $ 25.2 |  |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 161,978,000,000 | 208,046,000,000 | 195,930,000,000
Share-based compensation expense | $ (36.4) | $ (23.2) | $ (20.7)
Average fair value of stock options granted, in dollars per share | $ 332,850,000 | $ 207,230,000 | $ 170,310,000
Total unrecognized compensation cost from stock option arrangements granted under the plan, in USD | $ 14.7 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period | 3 years |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 268,922,000,000 | 425,444,000,000 | 430,496,000,000
Share-based compensation expense | $ (17.9) | $ (16.1) | $ (14.1)
Average fair value of stock options granted, in dollars per share | $ 79,090,000.00 | $ 47,530,000 | $ 35,960,000
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 112,227,000,000 | 214,425,000,000 | 139,730,000,000
Average fair value of stock options granted, in dollars per share | $ 287,840,000 | $ 184,350,000 | $ 165,070,000.00

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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: 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 Amount, after tax, of expense for award under share-based payment arrangement. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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- 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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -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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