Employee Share-Based Incentive Compensation Plans - Performance Shares (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Target Performance Shares Outstanding | ||||||
| Beginning of period (in shares) | 31,190 | 32,392 | 32,416 | 34,859 | ||
| Shares paid or expired (in shares) | 0 | 0 | (10,835) | (13,150) | ||
| New grants (in shares) | 0 | 25 | 9,615 | 10,670 | ||
| Forfeitures and cancellations (in shares) | 0 | (1) | (6) | 37 | ||
| End of period (in shares) | 31,190 | 32,416 | 31,190 | 32,416 | ||
| Accrued Expense | ||||||
| Beginning of period | $ 48.0 | $ 29.8 | $ 73.2 | $ 71.1 | ||
| Shares paid or expired | 0.0 | 0.0 | (44.1) | (48.7) | ||
| New grants | 0.0 | 0.0 | 0.0 | 0.0 | ||
| Forfeitures and cancellations | 0.0 | (0.3) | 0.3 | 0.3 | ||
| Expense recognized | 1.2 | 22.5 | 19.8 | 29.3 | ||
| End of period | $ 49.2 | $ 52.0 | $ 49.2 | $ 52.0 | ||
| Performance Share | ||||||
| Accrued Expense | ||||||
| Percentage of target payout - minimum actual | 184.00% | 200.00% | ||||