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Postretirement Plans - Summary of Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - U.S. Postretirement Health Care Plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Net periodic benefit cost: |  |  |
Interest cost | $ 1.9 | $ 1.8 | $ 2.1
Expected return on plan assets | (0.7) | (0.8) | (0.8)
Amortization of unrecognized gain | (0.8) | (0.4) | (0.3)
Net periodic benefit cost | 0.4 | 0.6 | 1.0
Changes in benefit obligations recognized in OCI, net of tax: |  |  |
Net (gain) loss | $ 2.4 | $ (1.4) | $ 0.6

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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