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Schedule of Pension Plans with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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UNITED STATES |  |
Defined Benefit Plan Disclosure |  |
Projected benefit obligation | $ 60.8 | $ 55.3
Accumulated benefit obligation | 58.5 | 53.2
Fair value of plan assets | 0.0 |
Foreign Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure |  |
Projected benefit obligation | 51.0 | 44.0
Accumulated benefit obligation | 46.5 | 39.9
Fair value of plan assets | $ 1.9 | $ 1.6

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