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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net income | $ 433.6 | $ 425.5 | $ 619.0
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 | 3.4 | 3.3 | 2.5
Amortization of prior service credit, net of tax of $0.0, $0.0 and $0.0, respectively | 0.0 | 0.0 | 0.1
Net gain (loss) arising during the period, net of tax of $(2.6), ($4.7) and $0.2, respectively | (8.3) | (14.1) | 0.4
Settlement cost, net of tax of $2.7, $1.6 and $1.4, respectively | 8.6 | 4.7 | 2.2
Postretirement Benefit Plans: |  |  |
Amortization of prior service credit, net of tax of ($0.6), ($0.6) and ($0.3), respectively | (1.7) | (1.7) | (0.6)
Amortization of deferred net gain, net of tax of $0.0, $0.0 and $0.0, respectively | (0.2) | 0.0 | 0.0
Prior service cost arising during the period, net of tax of $0.0, $0.0 and $4.0, respectively | 0.0 | 0.0 | 6.3
Net gain (loss) arising during the period, net of tax of ($0.1), $0.7 and ($0.2), respectively | (0.2) | 2.1 | (0.6)
Settlement cost, net of tax of $0.0, $0.0 and $0.2, respectively | 0.0 | 0.0 | 0.5
Other comprehensive income (loss), net of tax | 1.0 | (5.7) | 10.6
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 0.6 | 0.0 | 0.0
Comprehensive income | $ 434.6 | $ 419.8 | $ 629.6

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