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Stock and Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of stock-based compensation expense by type of award | The following table summarizes our stock-based compensation expense by type of award (in millions):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
PRSUs | $ | 4.1 |  |  | $ | 3.4 |  |  | $ | 1.6 |
RSUs | 9.0 |  |  | 8.0 |  |  | 5.0 |
Service options | 0.7 |  |  | 0.9 |  |  | 1.0 |
Market options | 2.7 |  |  | 4.3 |  |  | 5.6 |
Total stock-based compensation expense | $ | 16.5 |  |  | $ | 16.6 |  |  | $ | 13.2 |
PRSUs |
Stock and Stock-Based Compensation Plans |
Summary of PRSU activity | The following table summarizes PRSU activity, including dividend equivalents, under the Omnibus Plan for the year ended December 31, 2023:
Performance-Based Restricted Stock Units |  | Number |  | Weighted Average Grant Date Fair Value
PRSUs at January 1, 2023 |  | 1,456,736 |  |  | $ | 18.24 |
Granted |  | 540,752 |  |  | 16.09 |
Vested |  | — |  |  | N/A
Forfeited |  | (418,893) |  |  | 22.25 |
PRSUs at December 31, 2023 |  | 1,578,595 |  |  | $ | 16.44 |
RSUs |
Stock and Stock-Based Compensation Plans |
Summary of RSU activity | The following table summarizes RSU activity, including dividend equivalents, under the Omnibus Plan for the year ended December 31, 2023:
Restricted Stock Units |  | Number |  | Weighted Average Grant Date Fair Value
RSUs at January 1, 2023 |  | 1,365,882 |  |  | $ | 14.88 |
Granted |  | 606,728 |  |  | 14.19 |
Vested |  | (544,191) |  |  | 15.56 |
Forfeited |  | (78,543) |  |  | 15.23 |
RSUs at December 31, 2023 |  | 1,349,876 |  |  | $ | 14.27 |
Service options |
Stock and Stock-Based Compensation Plans |
Summary of option activity | The following table summarizes service option activity under the Omnibus Plan for the year ended December 31, 2023:
Service Options | Number |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2023 | 1,286,097 |  |  | $ | 14.71 |  |  |  |  |
Granted | 53,222 |  |  | 14.83 |  |  |  |  |
Exercised | (156,752) |  |  | 11.31 |  |  |  |  |
Forfeited | — |  |  | N/A |  |  |  |
Canceled | (19,293) |  |  | 14.05 |  |  |  |  |
Outstanding at December 31, 2023 | 1,163,274 |  |  | $ | 15.18 |  |  | 6.1 years |  | $ | 1.1 |
Exercisable at December 31, 2023 | 665,409 |  |  | $ | 14.64 |  |  | 5.0 years |  | $ | 0.9 |
Market Options |
Stock and Stock-Based Compensation Plans |
Summary of option activity | The following table summarizes market option activity under the Omnibus Plan for the year ended December 31, 2023:
Market Options | Number |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2023 | 3,557,134 |  |  | $ | 16.09 |  |  |  |  |
Granted | 212,886 |  |  | 14.83 |  |  |  |
Exercised | — |  |  | N/A |  |  |  |
Forfeited | — |  |  | N/A |  |  |  |
Canceled | — |  |  | N/A |  |  |  |
Outstanding at December 31, 2023 | 3,770,020 |  |  | $ | 16.02 |  |  | 7.5 years |  | $ | 1.5 |
Exercisable at December 31, 2023 | — |  |  | N/A |  | N/A |  | N/A

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