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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net income | $ 205.1 | $ 183.4 | $ 370.8 | $ 324.2
Pension Plan and Restoration of Retirement Income Plan: |  |  |  |
Amortization of deferred net loss, net of tax of $0.3, $0.5, $0.8 and $1.3, respectively | 0.8 | 0.6 | 2.5 | 2.0
Settlement cost, net of tax of $1.1, $0.0 , $1.1 and $0.0, respectively | 3.1 | 0.0 | 3.1 | 0.0
Postretirement Benefit Plans: |  |  |  |
Prior service cost arising during the period, net of tax of $0.0, $4.1, $0.0 and $4.1, respectively | 0.0 | 6.7 | 0.0 | 6.7
Amortization of prior service credit, net of tax of ($0.1), ($0.2), ($0.4) and ($0.2), respectively | (0.5) | (0.2) | (1.3) | (0.2)
Other comprehensive income, net of tax | 3.4 | 7.6 | 4.3 | 9.0
Comprehensive income | 208.5 | 191.0 | 375.1 | 333.2
Other Comprehensive Income (Loss), Postretirement Plan, Settlement and Curtailment Gain (Loss), after Tax | $ 0.0 | $ 0.5 | $ 0.0 | $ 0.5

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