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Retirement Plans, Postretirement and Postemployment Benefits - Net Periodic Benefit Credit or Cost Not Yet Recognized (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prior service (credit) - Gross | $ 42.4 | $ 48.2
Actuarial (gain) loss - Gross | 63.4 | 43.2
Total - Gross | 105.8 | 91.4
Prior service cost (credit) - Net of tax | 20.0 | 20.3
Actuarial (gain) loss - Net of tax | 29.9 | 18.2
Total - Net of tax | 49.9 | 38.5
Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prior service (credit) - Gross | (0.4) | (0.7)
Actuarial (gain) loss - Gross | (3.7) | (4.1)
Total - Gross | (4.1) | (4.8)
Prior service cost (credit) - Net of tax | (0.2) | (0.3)
Actuarial (gain) loss - Net of tax | (1.7) | (1.7)
Total - Net of tax | $ (1.9) | $ (2.0)

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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