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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans [Member] |  |  |
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Amortization of prior service cost, net of tax of $0.1, $0.1 and $0.1, respectively | $ 0.1 | $ 0.1 | $ 0.1
Amortization of deferred net loss, net of tax of $0.1, $0.2 and $0.2, respectively | 0.1 | 0.2 | 0.2
Net (loss) gain arising during the period, net of tax of $0.0, $1.0 and ($2.4), respectively | 0.0 | 1.0 | (2.4)
Regulatory classification of certain pension costs, net of tax of $1.2, $0.0 and $0.0, respectively | 1.2 | 0.0 | 0.0
Settlement cost, net of tax of $0.0, $0.4 and $4.3, respectively | 0.0 | 0.4 | 4.3
Other Postretirement Benefits Plan [Member] |  |  |
Postretirement plans: |  |  |
Amortization of prior service credit, net of tax of $0.0, $0.0 and ($0.1), respectively | 0.0 | 0.0 | (0.1)
Amortization of deferred net gain, net of tax of $(0.1), ($0.1) and $0.0, respectively | (0.1) | (0.1) | 0.0
Net gain (loss) arising during the period, net of tax of $0.2, ($0.2) and $1.7, respectively | $ 0.2 | $ (0.2) | $ 1.7

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