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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) Parenthetical - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Pension Plan and Restoration of Retirement Income Plan: |  |  |  |
Amortization of deferred net loss | $ 0.4 | $ 0.6 | $ 0.8 | $ 1.4
Settlement cost | 3.2 | 0.0 | 3.2 | 0.0
Postretirement Benefit Plans: |  |  |  |
Amortization of deferred net loss | 0.0 | 0.2 | 0.0 | 0.4
Amortization of prior service cost | (0.3) | (0.2) | (0.5) | (0.5)
Amortization of deferred interest rate swap hedging losses | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Amount of tax expense (benefit) related to gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Settlement of a Pension or Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6531942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 + Details
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