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Contingent liabilities and other financial obligations, narrative (Details) | Dec. 22, 2017 USD ($) producer | Dec. 31, 2017 facility
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Disclosure of contingent liabilities [line items] |  |
Number of U. S. carbon black producers settled with U.S. government | producer | 5 |
Number of facilities located in the United States | facility |  | 4
Legal proceedings contingent liability |  |
Disclosure of contingent liabilities [line items] |  |
Estimated time period to install capital improvements in all U.S. facilities (up to) | 6 years |
Environmental loss contingency, civil penalty to the EPA | $ 800,000 |
Environmental loss contingency, mitigation projects | 550,000 |
Legal proceedings contingent liability | Bottom of range |  |
Disclosure of contingent liabilities [line items] |  |
Estimated capital cost to install controls in all U.S. facilities | 110,000,000 |
Legal proceedings contingent liability | Top of range |  |
Disclosure of contingent liabilities [line items] |  |
Estimated capital cost to install controls in all U.S. facilities | $ 140,000,000 |

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