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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule Of Stock-based Compensation Expense By Award Type | The tables below summarize the Company’s stock-based compensation expense by award type and expense category line item during the periods indicated (in millions).
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
Award type |  | 2024 |  | 2023 |  | 2024 |  | 2023
Stock appreciation rights |  | $ | 3.0 |  |  | $ | 3.1 |  |  | $ | 7.6 |  |  | $ | 5.6 |
Restricted stock units |  | 36.4 |  |  | 28.9 |  |  | 82.0 |  |  | 71.1 |
Common stock equivalents |  | 0.3 |  |  | 0.3 |  |  | 0.6 |  |  | 0.6 |
Total (1) |  | $ | 39.7 |  |  | $ | 32.3 |  |  | $ | 90.2 |  |  | $ | 77.3 |
Schedule Of Stock-Based Compensation Expense By Expense Category |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
Expense category line item |  | 2024 |  | 2023 |  | 2024 |  | 2023
Cost of services and product development |  | $ | 15.3 |  |  | $ | 12.7 |  |  | $ | 34.8 |  |  | $ | 31.0 |
Selling, general and administrative |  | 24.4 |  |  | 19.6 |  |  | 55.4 |  |  | 46.3 |
Total (1) |  | $ | 39.7 |  |  | $ | 32.3 |  |  | $ | 90.2 |  |  | $ | 77.3 |
(1)Includes costs of $18.4 million and $13.1 million during the three months ended June 30, 2024 and 2023, respectively, and $49.0 million and $39.9 million during the six months ended June 30, 2024 and 2023, respectively, for awards to retirement-eligible employees. Those awards vest on an accelerated basis.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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