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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, 2019 | Dec. 31, 2018
Environmental Liability and Related Assets [Roll Forward] |  |  |
Balance as of January 1 | $ 66.8 | $ 73.9 |
Changes in estimates for pre-existing accruals | 0.5 | 6.6 |
Accruals added during the period for new matters | 0.0 | 2.0 |
Net cash activity(a) | (5.4) | (15.8) | [1]
Foreign currency | 0.0 | 0.1 |
Balance as of December 31 | $ 61.9 | $ 66.8 |
[1] | (a) Includes cash payments for the year ended December 31, 2018 of $10.2, related to the sale of a former operating location.

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