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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Parenthetical - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pension Plan and Restoration of Retirement Income Plan: |  |  |
Amortization of deferred net loss | $ 1.7 | $ 2.2 | $ 1.2
Net gain (loss) arising during the period | (0.6) | (5.8) | (7.0)
Settlement cost | 3.2 | 2.9 | (0.1)
Postretirement plans: |  |  |
Amortization of deferred net loss | 0.0 | 0.8 | 0.5
Net gain (loss) arising during the period | 0.1 | 5.6 | (1.9)
Amortization of prior service cost | (1.0) | (1.1) | (1.1)
Amortization of deferred interest rate swap hedging losses | $ 0.0 | $ 0.0 | $ 0.1

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