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Stock-Based Compensation Plans - RSUs and PSUs (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Feb. 28, 2023
Additional share-based compensation disclosures |  |  |  |  |  |
Total unrecognized compensation cost |  |  | $ 73.9 |  |  |
Unvested RSUs and PSUs expected to be settled through issuance of common stock (in units) |  |  | 582,012 |  |  |
Common stock to be issued for settlement of unvested RSUs and PSUs (in shares) |  |  | 802,184 |  |  |
Weighted average recognition period for unrecognized compensation cost (in years) |  |  | 1 year 8 months 12 days |  |  |
RSUs, 2022 grants |  |  |  |  |  |
Units |  |  |  |  |  |
The number of grants made during the period 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). |  |  | 192,798 |  |  |
Share of common stock |  |  | 1 |  |  |
RSUs, 2021 grant |  |  |  |  |  |
Units |  |  |  |  |  |
The number of grants made during the period 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). |  |  |  | 191,139 |  |
Share of common stock |  |  |  | 1 |  |
RSUs, 2020 grant |  |  |  |  |  |
Units |  |  |  |  |  |
The number of grants made during the period 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). |  |  |  |  | 330,144 |
Share of common stock |  |  |  |  | 1 |
PSUs, 2022 grants |  |  |  |  |  |
Units |  |  |  |  |  |
The number of grants made during the period 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). |  |  | 112,451 |  |  |
PSUs, 2021 grant |  |  |  |  |  |
Units |  |  |  |  |  |
The number of grants made during the period 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). |  |  |  | 127,356 |  |
PSUs, 2020 grant |  |  |  |  |  |
Units |  |  |  |  |  |
The number of grants made during the period 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). |  |  |  |  | 210,403 |
PSUs, 2019 grant |  |  |  |  |  |
Changes |  |  |  |  |  |
Vested (in units) |  |  | (196,944) |  |  |
Settled (in shares) |  |  |  |  |  | (393,888)
Restricted stock units (RSUs) and performance stock units (PSUs) |  |  |  |  |  |
Units |  |  |  |  |  |
Payments to tax authorities on employees' behalf for shares withheld related to share settlements |  |  | $ 39.7 | $ 21.2 | $ 23.1 |
Changes |  |  |  |  |  |
Unvested at the beginning of the year (in units) |  | 582,012 | 831,597 |  |  |
Granted (in shares) |  |  | 305,249 | 318,495 | 540,547 |
Vested (in units) |  |  | (518,743) |  |  |
Cancelled or forfeited (in units) |  |  | (36,091) |  |  |
Unvested at the end of the period (in units) |  |  | 582,012 | 831,597 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per unit) |  | $ 164.60 | $ 105.12 |  |  |
Granted (in dollars per unit) |  |  | 187.31 | $ 141.41 | $ 82.81 |
Vested (in dollars per unit) |  |  | 84.82 |  |  |
Cancelled or forfeited (in dollars per unit) |  |  | 132.95 |  |  |
Unvested at the end of the period (in dollars per unit) |  |  | $ 164.60 | $ 105.12 |  |
Additional share-based compensation disclosures |  |  |  |  |  |
Fair value of vested units |  |  | $ 147.2 | $ 126.0 | $ 54.0 |
Performance stock units (PSUs) |  |  |  |  |  |
Units |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |  |
Performance target period (in years) | 3 years | 3 years | 3 years |  |  |
Maximum | PSUs, 2022 grants |  |  |  |  |  |
Units |  |  |  |  |  |
Share of common stock |  |  | 2 |  |  |
Maximum | PSUs, 2021 grant |  |  |  |  |  |
Units |  |  |  |  |  |
Share of common stock |  |  |  | 2 |  |
Maximum | PSUs, 2020 grant |  |  |  |  |  |
Units |  |  |  |  |  |
Share of common stock |  |  |  |  | 2 |
Directors Equity Plan | Stock Awards |  |  |  |  |  |
Changes |  |  |  |  |  |
Granted (in shares) |  |  | 6,136 | 6,248 | 12,807 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Granted (in dollars per unit) |  |  | $ 182.41 | $ 166.39 | $ 91.30 |

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