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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Amortization of deferred net loss, net of tax of $1.1, $1.1 and $1.4, respectively | $ 1.1 | $ 1.1 | $ 1.4
Net gain (loss) arising during the period, net of tax of $(2.6), ($4.7) and $0.2, respectively | (2.6) | (4.7) | 0.2
Amortization of prior service credit, net of tax of $0.0, $0.0 and $0.0, respectively | 0.0 | 0.0 | 0.0
Postretirement plans: |  |  |
Prior service cost arising during the period, net of tax of $0.0, $0.0 and $4.0, respectively | 0.0 | 0.0 | 4.0
Amortization of deferred net gain, 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 ($0.1), $0.7 and ($0.2), respectively | (0.1) | 0.7 | (0.2)
Amortization of prior service credit, net of tax of ($0.6), ($0.6) and ($0.3), respectively | (0.6) | (0.6) | (0.3)
Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0 and $0.0, respectively | 0.0 | 0.0 | 0.0
Pension Plans [Member] |  |  |
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Settlement cost, net of tax of $2.7, $1.6 and $1.4, respectively | 2.7 | 1.6 | 1.4
Other Postretirement Benefits Plan [Member] |  |  |
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Settlement cost, net of tax of $2.7, $1.6 and $1.4, respectively | $ 0.0 | $ 0.0 |
Postretirement plans: |  |  |
Settlement cost, net of tax of $0.0, $0.0 and $0.2, respectively |  |  | $ 0.2

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