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Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Commitments And Contingencies Disclosure [Abstract] |  |
Accrual for environmental loss contingencies, gross | $ 16.0 | $ 16.4
Accrued environmental loss contingencies, current | 5.6 | 4.1
Accrued environmental loss contingencies, noncurrent | $ 10.4 | $ 12.3

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