Employee Share-Based Incentive Compensation Plans - Performance Shares (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Target Performance Shares Outstanding | ||||||
| Beginning of period (in shares) | 32,392 | 34,007 | 34,859 | 37,031 | ||
| Shares paid or expired (in shares) | 0 | 0 | (13,150) | (13,475) | ||
| New grants (in shares) | 0 | 1,000 | 10,645 | 11,405 | ||
| Forfeitures and cancellations (in shares) | 0 | (15) | 38 | 31 | ||
| End of period (in shares) | 32,392 | 34,007 | 32,392 | 34,992 | 32,392 | 34,992 |
| Accrued Expense | ||||||
| Beginning of period | $ 23.3 | $ 44.2 | $ 71.1 | $ 69.4 | ||
| Shares paid or expired | 0.0 | 0.0 | (48.7) | (44.9) | ||
| New grants | 0.0 | 0.0 | 0.0 | 0.0 | ||
| Forfeitures and cancellations | (0.2) | 0.0 | 0.6 | 0.3 | ||
| Expense recognized | 6.7 | 7.8 | 6.8 | 27.2 | ||
| End of period | $ 23.3 | $ 44.2 | $ 29.8 | $ 52.0 | $ 29.8 | $ 52.0 |
| Performance Share | ||||||
| Accrued Expense | ||||||
| Percentage of target payout - minimum actual | 200.00% | 188.00% | ||||