Employee Share-Based Incentive Compensation Plans - Performance Shares (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Target Performance Shares Outstanding | ||||
| Beginning of period (in shares) | 34,859 | 37,031 | ||
| Shares paid or expired (in shares) | (13,150) | (13,475) | ||
| New grants (in shares) | 10,645 | 10,405 | ||
| Forfeitures and cancellations (in shares) | 38 | 46 | ||
| End of period (in shares) | 32,392 | 34,007 | 32,392 | 34,007 |
| Accrued Expense | ||||
| Beginning of period | $ 71.1 | $ 69.4 | ||
| Shares paid or expired | (48.7) | (44.9) | ||
| New grants | 0.0 | 0.0 | ||
| Forfeitures and cancellations | 0.8 | 0.3 | ||
| Expense recognized | 0.1 | 19.4 | ||
| End of period | $ 23.3 | $ 44.2 | $ 23.3 | $ 44.2 |
| Performance Share | ||||
| Accrued Expense | ||||
| Percentage of target payout - minimum actual | 200.00% | 188.00% | ||