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Employee Benefit and Retirement Plans - Summary of Under-Funded or Non-Funded Pension Benefit Plans with Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 1,791.6 | $ 1,662.0
Fair value of plan assets | $ 1,435.3 | $ 1,297.1

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