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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Amortization of deferred net loss, net of tax of $1.1, $1.4 and $1.7, respectively | $ 1.1 | $ 1.4 | $ 1.7
Net gain (loss) arising during the period, net of tax of ($4.7), $0.2 and ($0.6), respectively | (4.7) | 0.2 | (0.6)
Amortization of prior service cost, 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, $4.0 and $0.0, respectively | 0.0 | (4.0) | 0.0
Amortization of deferred net 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 $0.7, ($0.2) and $0.1, respectively | 0.7 | (0.2) | 0.1
Amortization of prior service credit, net of tax of ($0.6), ($0.3) and ($1.0), respectively | (0.6) | (0.3) | (1.0)
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 $1.6, $1.4 and $3.2, respectively | 1.6 | 1.4 | 3.2
Other Postretirement Benefits Plan [Member] |  |  |
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Settlement cost, net of tax of $1.6, $1.4 and $3.2, respectively | $ 0.0 | $ 0.2 |
Postretirement plans: |  |  |
Settlement cost, net of tax of $0.0, $0.2 and $0.0, respectively |  |  | $ 0.0

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