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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Postretirement plans: |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest | $ 0.0 | $ 0.3 | $ (0.2)
Pension Plans [Member] |  |  |
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Amortization of prior service cost, net of tax of $0.1, $0.0 and $0.0, respectively | 0.1 | 0.0 | 0.0
Amortization of deferred net loss, net of tax of $0.2, $0.9 and $1.2, respectively | 0.2 | 0.9 | 1.2
Net gain (loss) arising during the period, net of tax of ($2.4), $0.0 and ($1.7), respectively | (2.4) | 0.0 | (1.7)
Prior service cost arising during the period, net of tax of $0.0, ($0.3) and $0.0, respectively | 0.0 | (0.3) | 0.0
Settlement cost, net of tax of $4.3, $2.7 and $0.7, respectively | 4.3 | 2.7 | 0.7
Other Postretirement Benefits Plan [Member] |  |  |
Postretirement plans: |  |  |
Amortization of prior service credit, net of tax of ($0.1), ($0.4) and ($0.6), respectively | (0.1) | (0.4) | (0.6)
Amortization of deferred net (gain) loss, net of tax of $0.0, $0.0 and $0.0, respectively | 0.0 | 0.0 | 0.0
Net gain (loss) arising during the period, net of tax of $1.7, ($0.2) and ($0.8), respectively | 1.7 | (0.2) | (0.8)
Curtailment cost, net of tax of $0.0, $0.0 and ($0.1), respectively | $ 0.0 | $ 0.0 | $ (0.1)

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