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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Pension Plan and Restoration of Retirement Income Plan: |  |  |  |
Amortization of deferred net loss | $ 0.6 | $ 0.3 | $ 1.4 | $ 0.6
Postretirement Benefit Plans: |  |  |  |
Amortization of deferred net loss | 0.2 | 0.2 | 0.4 | 0.3
Amortization of prior service cost | (0.2) | (0.3) | (0.5) | (0.6)
Amortization of deferred interest rate swap hedging losses | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.1

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