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Defined contribution and defined benefit retirement- Schedule of Rollforward of Change in Fair Value of Level 3 Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items] |  |
Fair value at beginning of the year | $ 429.6 |
Fair value at end of the year | 462.9 | $ 429.6
Significant Unobservable Inputs (Level 3) |  |
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items] |  |
Fair value at beginning of the year | 264.8 | 320.5
Gain (loss) on assets held at end of year | 11.1 | (31.0)
Gain (loss) on assets sold during the year | 14.4 | (3.6)
Assets purchased | 1.7 | 13.8
Assets sold | (9.3) | (15.5)
Transfers in (out) |  | (0.1)
Currency exchange rate fluctuations | 9.4 | (19.3)
Fair value at end of the year | $ 292.1 | $ 264.8

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