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Defined contribution and defined benefit retirement plans - Schedule of Defined Benefit Pension Plans Balances (for which Accumulated Benefit Obligation Exceeds Fair Value of Plan Assets) (Detail) - Foreign Pension Plans Defined Benefit - Defined benefit pension plans - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation (PBO) | $ 463.1 | $ 403.5
Accumulated Benefit Obligation (ABO) | 452.9 | 392.4
Fair value of plan assets | $ 313.8 | $ 276.0

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