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Commitments and Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) - Environmental Related Matters [Member] - Liability [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Environmental Liability and Related Assets [Roll Forward] |  |
Balance as of January 1 | $ 61.9 | $ 66.8
Changes in estimates for pre-existing accruals: |  |
Net cash activity | (3.7) | (5.4)
Foreign currency | 0.2 |
Balance as of December 31 | 58.3 | 61.9
Continuing Operations [Member] |  |
Changes in estimates for pre-existing accruals: |  |
Continuing operations | 1.4 | 0.4
Discontinued operations | (1.4) | (0.4)
Discontinued Operations [Member] |  |
Changes in estimates for pre-existing accruals: |  |
Continuing operations | (1.5) | 0.1
Discontinued operations | $ 1.5 | $ (0.1)

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