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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Costs Associated with Share-Based Compensation Plans | The following table summarizes the costs associated with the Company’s share-based compensation plans:
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | (in millions) |
Expense: |  |  |  |  |  |  |  |  |
RSUs |  | $ | 38.4 |  |  | $ | 57.9 |  |  | $ | 47.7 |
PRSUs |  |  | 4.5 |  |  |  | 2.8 |  |  |  | — |
Employee stock purchase plan |  |  | 6.2 |  |  |  | 6.6 |  |  |  | 5.9 |
|  | $ | 49.1 |  |  | $ | 67.3 |  |  | $ | 53.6 |
Summary of RSU and PSRU Activity | The following table summarizes RSU and PRSU activity for the year ended December 31, 2023:
(in millions, except weighted-average grant-date fair value) |  | Shares |  |  | Weighted-average grant-date fair value |
Unvested at December 31, 2022 |  |  | 0.9 |  |  | $ | 63.01 |
Granted during 2023 |  |  | 0.8 |  |  |  | 63.73 |
Vested during 2023 |  |  | (0.7 | ) |  |  | 62.30 |
Unvested at December 31, 2023 |  |  | 1.0 |  |  | $ | 64.19 |

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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 the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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