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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postretirement plans: |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest | $ 0.0 | $ 0.0 | $ 0.3
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 $0.0, respectively | 0.1 | 0.1 | 0.0
Amortization of deferred net loss, net of tax of $0.2, $0.2 and $0.9, respectively | 0.2 | 0.2 | 0.9
Net gain (loss) arising during the period, net of tax of $1.0, ($2.4) and $0.0, respectively | 1.0 | (2.4) | 0.0
Prior service cost arising during the period, net of tax of $0.0, $0.0 and ($0.3), respectively | 0.0 | 0.0 | (0.3)
Settlement cost, net of tax of $0.4, $4.3 and $2.7, respectively | 0.4 | 4.3 | 2.7
Other Postretirement Benefits Plan [Member] |  |  |
Postretirement plans: |  |  |
Amortization of prior service credit, net of tax of $0.0, ($0.1) and ($0.4), respectively | 0.0 | (0.1) | (0.4)
Amortization of deferred net (gain) loss, net of tax of ($0.1), $0.0 and $0.0, respectively | (0.1) | 0.0 | 0.0
Net gain (loss) arising during the period, net of tax of ($0.2), $1.7 and ($0.2), respectively | $ (0.2) | $ 1.7 | $ (0.2)

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