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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 18.6 | $ 38.3
Pension Plan and Restoration of Retirement Income Plan: |  |
Amortization of prior service cost, net of tax of $0.1 and $0.0, respectively | 0.0 | 0.1
Amortization of deferred net loss, net of tax of $0.0 and $0.1, respectively | 0.1 | 0.2
Regulatory classification of certain pension costs, net of tax of $1.2 and $0.0, respectively | 3.9 | 0.0
Settlement cost, net of tax of $0.0 and $0.2, respectively | 0.0 | 0.9
Postretirement benefit plans: |  |
Amortization of deferred net gain, net of tax of $0.0 and $0.0, respectively | (0.1) | (0.1)
Other comprehensive income, net of tax | 3.9 | 1.1
Comprehensive income | $ 22.5 | $ 39.4

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