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Defined Contribution and Defined Benefit Retirement Plans - Rollforward of Change in Fair Value of Level 3 Assets (Detail) - Level 3 - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Fair value at beginning of year | $ 310.3 | $ 314.3
Gain (loss) on assets held at end of year | (31.0) | 15.6
Gain (loss) on assets sold during the year | (0.7) | 0.4
Assets purchased | 13.8 | 16.2
Assets sold | (14.9) | (14.8)
Transfers in |  | 3.5
Currency exchange rate fluctuations | (18.5) | (24.9)
Fair value at end of year | $ 259.0 | $ 310.3

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