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v3.24.0.1

Stock-Based Compensation Plans - RSUs and PSUs additional (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 29, 2024
Additional share-based compensation disclosures |  |  |  |  |
Total unrecognized compensation cost |  | $ 64.7 |  |  |
Weighted average recognition period for unrecognized compensation cost (in years) |  | 1 year 7 months 6 days |  |  |
RSUs, 2023 grants |  |  |  |  |
Units |  |  |  |  |
Share of common stock |  | 1 |  |  |
Changes |  |  |  |  |
Granted (in shares) |  | 109,683 |  |  |
RSUs, 2022 grants |  |  |  |  |
Units |  |  |  |  |
Share of common stock |  |  | 1 |  |
Changes |  |  |  |  |
Granted (in shares) |  |  | 192,798 |  |
RSUs, 2021 grant |  |  |  |  |
Units |  |  |  |  |
Share of common stock |  |  |  | 1 |
Changes |  |  |  |  |
Granted (in shares) |  |  |  | 191,139 |
PSUs, 2023 grants |  |  |  |  |
Changes |  |  |  |  |
Granted (in shares) |  | 84,129 |  |  |
PSUs, 2022 grants |  |  |  |  |
Changes |  |  |  |  |
Granted (in shares) |  |  | 112,451 |  |
PSUs, 2021 grant |  |  |  |  |
Changes |  |  |  |  |
Granted (in shares) |  |  |  | 127,356 |
Restricted stock units (RSUs) and performance stock units (PSUs) |  |  |  |  |
Units |  |  |  |  |
Vesting period (in years) |  | 3 years | 3 years | 3 years |
The number of grants made during the year on the basis of service and/or performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). |  | 193,812 | 305,249 | 318,495 |
Payments to tax authorities on employees' behalf for shares withheld related to share settlements |  | $ 54.1 | $ 39.7 | $ 21.2 |
Changes |  |  |  |  |
Unvested at the beginning of the year (in units) | 437,239 | 582,012 |  |  |
Granted (in shares) |  | 193,812 |  |  |
Vested (in units) |  | (310,485) |  |  |
Cancelled or forfeited (in units) |  | (28,100) |  |  |
Unvested at the end of the year (in units) |  | 437,239 | 582,012 |  |
Shares reserved for future grants (all plans) |  | 1,539,738 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Unvested at the beginning of the year (in dollars per unit) | $ 213.06 | $ 164.60 |  |  |
Granted (in dollars per unit) |  | 247.90 | $ 187.31 | $ 141.41 |
Vested (in dollars per unit) |  | 146.27 |  |  |
Cancelled or forfeited (in dollars per unit) |  | 187.55 |  |  |
Unvested at the end of the year (in dollars per unit) |  | $ 213.06 | $ 164.60 |  |
Additional share-based compensation disclosures |  |  |  |  |
Fair value of vested units |  | $ 123.8 | $ 147.2 | $ 126.0 |
Restricted stock and RSUs |  |  |  |  |
Units |  |  |  |  |
Performance target period (in years) |  | 3 years | 3 years | 3 years |
Performance stock units (PSUs) |  |  |  |  |
Units |  |  |  |  |
Vesting period (in years) |  | 3 years |  |  |
Performance target period (in years) | 3 years | 3 years | 3 years |  |
Changes |  |  |  |  |
Vested (in units) |  | (132,787) |  |  |
Settled (in shares) |  |  |  |  | (265,574)
Maximum | PSUs, 2023 grants |  |  |  |  |
Units |  |  |  |  |
Share of common stock |  | 2 |  |  |
Maximum | PSUs, 2022 grants |  |  |  |  |
Units |  |  |  |  |
Share of common stock |  |  | 2 |  |
Maximum | PSUs, 2021 grant |  |  |  |  |
Units |  |  |  |  |
Share of common stock |  |  |  | 2 |
Directors Equity Plan | Stock Awards |  |  |  |  |
Changes |  |  |  |  |
Granted (in shares) |  | 4,305 | 6,136 | 6,248 |
Weighted Average Grant Date Fair Value |  |  |  |  |
Granted (in dollars per unit) |  | $ 243.61 | $ 182.41 | $ 166.39 |

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