<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>333</ContextCount>
  <ElementCount>375</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>75</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001002 - Statement - Consolidated Statements of Operations of Orion Engineered Carbons S.A. (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedStatementsofOperationsofOrionEngineeredCarbonsSAUnaudited</Role>
      <ShortName>Consolidated Statements of Operations of Orion Engineered Carbons S.A. (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002003 - Statement - Consolidated Statements of Comprehensive Income of Orion Engineered Carbons S.A. (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedStatementsofComprehensiveIncomeofOrionEngineeredCarbonsSAUnaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income of Orion Engineered Carbons S.A. (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003004 - Statement - Consolidated Balance Sheets of Orion Engineered Carbons S.A. (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedBalanceSheetsofOrionEngineeredCarbonsSAUnaudited</Role>
      <ShortName>Consolidated Balance Sheets of Orion Engineered Carbons S.A. (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1004005 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1005006 - Statement - Consolidated Statements of Cash Flows of Orion Engineered Carbons S.A. (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedStatementsofCashFlowsofOrionEngineeredCarbonsSAUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows of Orion Engineered Carbons S.A. (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1006007 - Statement - Consolidated Statements of Changes in Stockholders??? Equity of Orion Engineered Carbons S.A. (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedStatementsofChangesinStockholdersEquityofOrionEngineeredCarbonsSAUnaudited</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders??? Equity of Orion Engineered Carbons S.A. (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1007008 - Statement - Consolidated Statements of Changes in Stockholders??? Equity of Orion Engineered Carbons S.A. (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/ConsolidatedStatementsofChangesinStockholdersEquityofOrionEngineeredCarbonsSAUnauditedParenthetical</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders??? Equity of Orion Engineered Carbons S.A. (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2101101 - Disclosure - Organization, Description of the Business and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/OrganizationDescriptionoftheBusinessandSummaryofSignificantAccountingPolicies</Role>
      <ShortName>Organization, Description of the Business and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2104102 - Disclosure - Recent Accounting Pronouncements Not Yet Adopted</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RecentAccountingPronouncementsNotYetAdopted</Role>
      <ShortName>Recent Accounting Pronouncements Not Yet Adopted</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2105103 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2109104 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/Inventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2112105 - Disclosure - Accounts Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccountsReceivable</Role>
      <ShortName>Accounts Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2116106 - Disclosure - Debt and Other Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligations</Role>
      <ShortName>Debt and Other Obligations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2123107 - Disclosure - Financial Instruments and Fair Value Measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInstrumentsandFairValueMeasurement</Role>
      <ShortName>Financial Instruments and Fair Value Measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2126108 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2130109 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2137110 - Disclosure - Restructuring Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RestructuringExpenses</Role>
      <ShortName>Restructuring Expenses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2140111 - Disclosure - Accumulated Other Comprehensive Income/(Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccumulatedOtherComprehensiveIncomeLoss</Role>
      <ShortName>Accumulated Other Comprehensive Income/(Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2145112 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2148113 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2150114 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2155115 - Disclosure - Financial Information by Segment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInformationbySegment</Role>
      <ShortName>Financial Information by Segment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2161116 - Disclosure - Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RelatedParties</Role>
      <ShortName>Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2202201 - Disclosure - Organization, Description of the Business and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/OrganizationDescriptionoftheBusinessandSummaryofSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Organization, Description of the Business and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/OrganizationDescriptionoftheBusinessandSummaryofSignificantAccountingPolicies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/Leases</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2310302 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/InventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/Inventories</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2313303 - Disclosure - Accounts Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccountsReceivableTables</Role>
      <ShortName>Accounts Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/AccountsReceivable</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2317304 - Disclosure - Debt and Other Obligations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligationsTables</Role>
      <ShortName>Debt and Other Obligations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/DebtandOtherObligations</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2324305 - Disclosure - Financial Instruments and Fair Value Measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInstrumentsandFairValueMeasurementTables</Role>
      <ShortName>Financial Instruments and Fair Value Measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/FinancialInstrumentsandFairValueMeasurement</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2327306 - Disclosure - Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EmployeeBenefitPlansTables</Role>
      <ShortName>Employee Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/EmployeeBenefitPlans</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2331307 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/StockBasedCompensation</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2338308 - Disclosure - Restructuring Expenses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RestructuringExpensesTables</Role>
      <ShortName>Restructuring Expenses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/RestructuringExpenses</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2341309 - Disclosure - Accumulated Other Comprehensive Income/(Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccumulatedOtherComprehensiveIncomeLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Income/(Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/AccumulatedOtherComprehensiveIncomeLoss</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2346310 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/EarningsPerShare</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2351311 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/CommitmentsandContingencies</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2356312 - Disclosure - Financial Information by Segment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInformationbySegmentTables</Role>
      <ShortName>Financial Information by Segment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/FinancialInformationbySegment</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2362313 - Disclosure - Related Parties (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RelatedPartiesTables</Role>
      <ShortName>Related Parties (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/RelatedParties</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2403401 - Disclosure - Organization, Description of the Business and Summary of Significant Accounting Policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/OrganizationDescriptionoftheBusinessandSummaryofSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Organization, Description of the Business and Summary of Significant Accounting Policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/OrganizationDescriptionoftheBusinessandSummaryofSignificantAccountingPoliciesPolicies</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - Leases - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/LeasesNarrativeDetails</Role>
      <ShortName>Leases - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Leases - Schedule of Minimum Lease Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/LeasesScheduleofMinimumLeasePaymentsDetails</Role>
      <ShortName>Leases - Schedule of Minimum Lease Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2411404 - Disclosure - Inventories - Schedule of Inventory (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/InventoriesScheduleofInventoryDetails</Role>
      <ShortName>Inventories - Schedule of Inventory (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2414405 - Disclosure - Accounts Receivable - Schedule of Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccountsReceivableScheduleofAccountsReceivableDetails</Role>
      <ShortName>Accounts Receivable - Schedule of Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2415406 - Disclosure - Accounts Receivable - Accounts Receivable, Expected Credit Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccountsReceivableAccountsReceivableExpectedCreditLossDetails</Role>
      <ShortName>Accounts Receivable - Accounts Receivable, Expected Credit Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2418407 - Disclosure - Debt and Other Obligations - Schedule of Debt Arrangements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligationsScheduleofDebtArrangementsDetails</Role>
      <ShortName>Debt and Other Obligations - Schedule of Debt Arrangements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2419408 - Disclosure - Debt and Other Obligations - Term Loan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligationsTermLoanDetails</Role>
      <ShortName>Debt and Other Obligations - Term Loan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2420409 - Disclosure - Debt and Other Obligations - Revolving Credit Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligationsRevolvingCreditFacilityDetails</Role>
      <ShortName>Debt and Other Obligations - Revolving Credit Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2421410 - Disclosure - Debt and Other Obligations - Local Bank Loans and Other Short Term Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligationsLocalBankLoansandOtherShortTermBorrowingsDetails</Role>
      <ShortName>Debt and Other Obligations - Local Bank Loans and Other Short Term Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2422411 - Disclosure - Debt and Other Obligations - Covenant Compliance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/DebtandOtherObligationsCovenantComplianceDetails</Role>
      <ShortName>Debt and Other Obligations - Covenant Compliance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2425412 - Disclosure - Financial Instruments and Fair Value Measurement - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInstrumentsandFairValueMeasurementNarrativeDetails</Role>
      <ShortName>Financial Instruments and Fair Value Measurement - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.orioncarbons.com/role/FinancialInstrumentsandFairValueMeasurementTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2428413 - Disclosure - Employee Benefit Plans - Net Periodic Benefit Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EmployeeBenefitPlansNetPeriodicBenefitCostDetails</Role>
      <ShortName>Employee Benefit Plans - Net Periodic Benefit Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2429414 - Disclosure - Employee Benefit Plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EmployeeBenefitPlansNarrativeDetails</Role>
      <ShortName>Employee Benefit Plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2432415 - Disclosure - Stock-Based Compensation - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensationNarrativeDetails</Role>
      <ShortName>Stock-Based Compensation - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2433416 - Disclosure - Stock-Based Compensation - Expenses Recorded Within Operating Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensationExpensesRecordedWithinOperatingIncomeDetails</Role>
      <ShortName>Stock-Based Compensation - Expenses Recorded Within Operating Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2434417 - Disclosure - Stock-Based Compensation - Movement of PSUs and RSUs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensationMovementofPSUsandRSUsDetails</Role>
      <ShortName>Stock-Based Compensation - Movement of PSUs and RSUs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2435418 - Disclosure - Stock-Based Compensation - Fair Value Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensationFairValueAssumptionsDetails</Role>
      <ShortName>Stock-Based Compensation - Fair Value Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2436419 - Disclosure - Stock-Based Compensation - Components of Stock-based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/StockBasedCompensationComponentsofStockbasedCompensationExpenseDetails</Role>
      <ShortName>Stock-Based Compensation - Components of Stock-based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2439420 - Disclosure - Restructuring Expenses - Schedule of Restructuring Activities and Related Reserves (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RestructuringExpensesScheduleofRestructuringActivitiesandRelatedReservesDetails</Role>
      <ShortName>Restructuring Expenses - Schedule of Restructuring Activities and Related Reserves (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2442421 - Disclosure - Accumulated Other Comprehensive Income/(Loss) - Schedule of Changes in AOCI, Net of Tax (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofChangesinAOCINetofTaxDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income/(Loss) - Schedule of Changes in AOCI, Net of Tax (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2443422 - Disclosure - Accumulated Other Comprehensive Income/(Loss) - Schedule of Amounts Reclassified out of AOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAmountsReclassifiedoutofAOCIDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income/(Loss) - Schedule of Amounts Reclassified out of AOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2444423 - Disclosure - Accumulated Other Comprehensive Income/(Loss) - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/AccumulatedOtherComprehensiveIncomeLossNarrativeDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income/(Loss) - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2447424 - Disclosure - Earnings Per Share - Schedule of Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/EarningsPerShareScheduleofEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share - Schedule of Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2449425 - Disclosure - Income Taxes - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/IncomeTaxesNarrativeDetails</Role>
      <ShortName>Income Taxes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2452426 - Disclosure - Commitments and Contingencies - Other Long-Term Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/CommitmentsandContingenciesOtherLongTermCommitmentsDetails</Role>
      <ShortName>Commitments and Contingencies - Other Long-Term Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2453427 - Disclosure - Commitments and Contingencies - Environmental Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/CommitmentsandContingenciesEnvironmentalMattersDetails</Role>
      <ShortName>Commitments and Contingencies - Environmental Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2454428 - Disclosure - Commitments and Contingencies - Pledges and Guarantees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/CommitmentsandContingenciesPledgesandGuaranteesDetails</Role>
      <ShortName>Commitments and Contingencies - Pledges and Guarantees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2457429 - Disclosure - Financial Information by Segment - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInformationbySegmentNarrativeDetails</Role>
      <ShortName>Financial Information by Segment - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2458430 - Disclosure - Financial Information by Segment -Schedule of the Relative Size of Revenue Recognized in each Reportable Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInformationbySegmentScheduleoftheRelativeSizeofRevenueRecognizedineachReportableSegmentDetails</Role>
      <ShortName>Financial Information by Segment -Schedule of the Relative Size of Revenue Recognized in each Reportable Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2459431 - Disclosure - Financial Information by Segment - Schedule of Segment Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInformationbySegmentScheduleofSegmentReconciliationDetails</Role>
      <ShortName>Financial Information by Segment - Schedule of Segment Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2460432 - Disclosure - Financial Information by Segment - Schedule of Income from Operations before Income Taxes and Finance Costs, Corporate and Other (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/FinancialInformationbySegmentScheduleofIncomefromOperationsbeforeIncomeTaxesandFinanceCostsCorporateandOtherDetails</Role>
      <ShortName>Financial Information by Segment - Schedule of Income from Operations before Income Taxes and Finance Costs, Corporate and Other (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="oec-20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2463433 - Disclosure - Related Parties - Narrative and Schedule of Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.orioncarbons.com/role/RelatedPartiesNarrativeandScheduleofRelatedPartyTransactionsDetails</Role>
      <ShortName>Related Parties - Narrative and Schedule of Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="oec-20200930.htm">oec-20200930.htm</File>
    <File>a2020-11x05ex311certif.htm</File>
    <File>a2020-11x05ex312certif.htm</File>
    <File>a2020-11x05ex321certif.htm</File>
    <File>a2020-11x05ex322certif.htm</File>
    <File>oec-20200930.xsd</File>
    <File>oec-20200930_cal.xml</File>
    <File>oec-20200930_def.xml</File>
    <File>oec-20200930_lab.xml</File>
    <File>oec-20200930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
