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Commitments and Contingencies - Environmental, Health, and Safety (EHS) Matters (Details) - EHS $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) landfill | Dec. 31, 2016 USD ($) landfill | Aug. 01, 2016 USD ($)
Environmental, Health, and Safety ("EHS") Matters |  |  |  |  |
Environmental accruals |  |  | $ 3.9 | $ 4.8 |
Environmental accruals included in other current liabilities |  |  | 1.3 | 0.2 |
Estimated closure and post-closure costs |  |  | $ 0.4 | $ 0.4 |
Number of landfills | landfill |  |  | 2 | 2 |
CRCT |  |  |  |  |
Environmental, Health, and Safety ("EHS") Matters |  |  |  |  |
Estimate of possible loss |  |  |  |  | $ 0.5
Payments for legal settlements | $ 0.3 | $ 0.2 |  |  |
Revised civil penalty | $ 0.5 |  |  |  |

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