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Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Environmental Remediation Obligations [Abstract] |  |  |
Balance at the beginning of the year | $ 99.7 |  |
Additions charged to expense | 0.5 |  |
Payments, net | (1.5) |  |
Other, net | (0.1) |  |
Balance at the end of the period | 98.6 |  |
Amounts recognized in our Condensed Consolidated Balance Sheet at the end of the period: |  |  |
Current liabilities |  | $ 4.3 | $ 4.5
Noncurrent liabilities |  | 94.3 | 95.2
Total | $ 98.6 | $ 98.6 | $ 99.7

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