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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, 2022 | Dec. 31, 2021
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Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prior service cost (credit) - Gross | $ 48.2 | $ 5.1
Actuarial (gain) loss - Gross | 43.2 | 166.2
Total - Gross | 91.4 | 171.3
Prior service cost (credit) - Net of tax | 20.3 | 3.0
Actuarial (gain) loss - Net of tax | 18.2 | 97.0
Total - Net of tax | 38.5 | 100.0
Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prior service cost (credit) - Gross | (0.7) | (1.5)
Actuarial (gain) loss - Gross | (4.1) | (2.4)
Total - Gross | (4.8) | (3.9)
Prior service cost (credit) - Net of tax | (0.3) | (0.9)
Actuarial (gain) loss - Net of tax | (1.7) | (1.4)
Total - Net of tax | $ (2.0) | $ (2.3)

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