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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net income | $ 55.0 | $ 36.0
Pension Plan and Restoration of Retirement Income Plan: |  |
Amortization of deferred net loss, net of tax of $0.2 and $0.4, respectively | 0.7 | 0.6
Postretirement Benefit Plans: |  |
Amortization of prior service cost, net of tax of ($0.1) and ($0.0), respectively | (0.5) | 0.0
Other comprehensive income, net of tax | 0.2 | 0.6
Comprehensive income | $ 55.2 | $ 36.6

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