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Defined contribution and defined benefit retirement - Schedule of Plans for which Accumulated Benefit Obligations Exceeds Plan Assets (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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United States |  |
Plans for which the ABO exceeds plan assets: |  |
Projected benefit obligations | $ 42.7 | $ 43.4
Accumulated benefit obligations | 42.7 | 43.4
Fair value of plan assets | 40.3 | 39.1
Non U.S. |  |
Plans for which the ABO exceeds plan assets: |  |
Projected benefit obligations | 463.1 | 403.5
Accumulated benefit obligations | 452.9 | 392.4
Fair value of plan assets | $ 313.8 | $ 276.0

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