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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net income | $ 425.5 | $ 619.0 | $ 338.2
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 | 3.3 | 2.5 | 2.8
Amortization of prior service cost, net of tax of $0.0, $0.0 and $0.0, respectively | 0.0 | (0.1) | 0.0
Net gain (loss) arising during the period, net of tax of ($4.7), $0.2 and ($0.6), respectively | (14.1) | 0.4 | (0.7)
Settlement cost, net of tax of $1.6, $1.4 and $3.2, respectively | 4.7 | 2.2 | 5.0
Postretirement Benefit Plans: |  |  |
Amortization of prior service credit, net of tax of ($0.6), ($0.3) and ($1.0), respectively | (1.7) | (0.6) | (1.5)
Prior service cost arising during the period, net of tax of $0.0, $4.0 and $0.0, respectively | 0.0 | 6.3 | 0.0
Net gain (loss) arising during the period, net of tax of $0.7, ($0.2) and $0.1, respectively | 2.1 | (0.6) | 0.2
Settlement cost, net of tax of $0.0, $0.2 and $0.0, respectively | 0.0 | 0.5 | 0.0
Other comprehensive income (loss), net of tax | (5.7) | 10.6 | 5.8
Comprehensive income | $ 419.8 | $ 629.6 | $ 344.0

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