CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Pension Plans [Member] | ||||
| Pension Plan and Restoration of Retirement Income Plan: | ||||
| Amortization of prior service cost, net of tax of $0.0, $0.0, $0.1 and $0.1, respectively | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.1 |
| Amortization of deferred net loss, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively | 0.0 | 0.0 | 0.0 | 0.0 |
| Other Postretirement Benefits Plan [Member] | ||||
| Postretirement plans: | ||||
| Amortization of deferred net gain, net of tax of $(0.0), $(0.0), $(0.0) and $(0.1), respectively | $ (0.0) | $ (0.0) | $ (0.0) | $ (0.1) |