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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Pension Plans [Member] |  |
Pension Plan and Restoration of Retirement Income Plan: |  |
Amortization of prior service cost, net of tax of $0.1 and $0.0, respectively | $ 0.1 | $ 0.0
Amortization of deferred net loss, net of tax of $0.0 and $0.1, respectively | 0.0 | 0.1
Regulatory classification of certain pension costs, net of tax of $1.2 and $0.0, respectively | 1.2 | 0.0
Settlement cost, net of tax of $0.0 and $0.2, respectively | 0.0 | 0.2
Other Postretirement Benefits Plan [Member] |  |
Postretirement plans: |  |
Amortization of deferred net gain, net of tax of $0.0 and $0.0, respectively | $ 0.0 | $ 0.0

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