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Retirement Plans, Postretirement and Postemployment Benefits - Net Periodic Benefit Cost Recognized Pretax Amounts in Comprehensive Earnings (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss (gain) | $ 20.9 | $ (114.5) | $ (67.5)
Prior service cost | 0.0 | 48.1 | 0.0
Prior service cost | (5.9) | (4.9) | (0.8)
Actuarial gain (loss) | (0.6) | (3.9) | (12.2)
Settlement charge | 0.0 | (4.6) | 0.0
Total | 14.4 | (79.8) | (80.5)
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss (gain) | (0.1) | (2.0) | (0.6)
Prior service cost | 0.3 | 0.9 | 0.8
Actuarial gain (loss) | 0.6 | 0.2 | 0.1
Total | $ 0.8 | $ (0.9) | $ 0.3

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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