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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Amortization of deferred net loss, net of tax of $1.4, $1.7 and $2.2, respectively | $ 1.4 | $ 1.7 | $ 2.2
Net gain (loss) arising during the period, net of tax of $0.2, ($0.6) and ($5.8), respectively | 0.2 | (0.6) | (5.8)
Amortization of prior service cost, net of tax of $0.0, $0.0 and $0.0, respectively | 0.0 | 0.0 | 0.0
Settlement cost, net of tax of $1.4, $3.2 and $2.9, respectively | 1.4 | 3.2 | 2.9
Postretirement plans: |  |  |
Settlement cost, net of tax of $0.2, $0.0 and $0.0, respectively | 0.2 | 0.0 | 0.0
Prior service cost arising during the period, net of tax of $4.0, $0.0 and $0.0, respectively | 4.0 | 0.0 | 0.0
Amortization of deferred net loss, net of tax of $0.0, $0.0 and $0.8, respectively | 0.0 | 0.0 | 0.8
Net (loss) gain arising during the period, net of tax of ($0.2), $0.1 and $5.6, respectively | (0.2) | 0.1 | 5.6
Amortization of prior service cost, net of tax of ($0.3), ($1.0) and ($1.1), respectively | (0.3) | (1.0) | (1.1)
Amortization of deferred interest rate swap hedging losses, net of tax of $0, $0 and $0.0, respectively | $ 0.0 | $ 0.0 | $ 0.0

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