XML 147 R110.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Commitments and Contingencies - Additional Information (Details) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 14, 2021 USD ($) mi | Jun. 30, 2018 party | Oct. 31, 2016 USD ($) | Mar. 03, 2016 USD ($) | Apr. 11, 2014 USD ($) mi | Sep. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) site mine party mi | Dec. 31, 2022 USD ($) | Oct. 18, 2021 | Apr. 30, 2015 USD ($)
Site Contingency |  |  |  |  |  |  |  |  |  |
Number of sites subject to remediation | site |  |  |  |  |  |  | 19 |  |  |
Number of sites subject to remediation activities, cost in excess of 100K | site |  |  |  |  |  |  | 14 |  |  |
Cost per site minimis threshold |  |  |  |  |  |  | $ 100,000 |  |  |
Number of sites, investigation completed | site |  |  |  |  |  |  | 15 |  |  |
Number of sites investigation in progress | site |  |  |  |  |  |  | 4 |  |  |
Number of sites subject to remediation activities, contains remediation systems | site |  |  |  |  |  |  | 7 |  |  |
Number of sites subject to remediation activities, monitored | site |  |  |  |  |  |  | 8 |  |  |
Number of sites subject to remediation activities, active operations | site |  |  |  |  |  |  | 1 |  |  |
Environmental |  |  |  |  |  |  | $ 39,000,000 | $ 42,100,000 |  |
Environmental, current |  |  |  |  |  |  | $ 8,200,000 |  |  |
Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag |  |  |  |  |  |  | Consolidated Balance Sheets |  |  |
Loss reserves |  |  |  |  |  |  | $ 26,900,000 |  |  |
Lower Passaic River Study Area |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation | mi |  |  |  |  | 8 |  |  |  |  |
Number of potentially responsible parties | party |  |  |  |  |  |  | 70 |  |  |
Estimate of cost |  |  |  |  |  |  |  |  |  | $ 726,000,000
Estimate low end |  |  | $ 165,000,000 |  |  |  |  |  |  |
Development period (years) |  |  | 4 years |  |  |  |  |  |  |
Potentially responsible parties | party |  | 120 |  |  |  |  |  |  |  |
Upper Nine Miles Of The River |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation | mi | 9 |  |  |  |  |  |  |  |  |
Estimate of loss exposure in excess of accrual | $ 441,000,000 |  |  |  |  |  |  |  |  |
Lower Passaic River Study Area, Lower Eight Miles |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  | $ 700,000 |  |  |
Accrual payments |  |  |  |  |  | $ 5,900,000 |  |  |  |
Arizona Uranium Mines |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  | $ 11,500,000 |  |  |
Investigate sites notice from EPA | mine |  |  |  |  |  |  | 8 |  |  |
Percentage of expenses reimbursable by the U.S. |  |  |  |  |  |  |  |  | 35.00% |
Future contributions from U.S. |  |  |  |  |  |  | $ 2,900,000 |  |  |
Water Valley, Mississippi |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Loss reserves |  |  |  |  |  |  | $ 13,500,000 |  |  |
Minimum | Lower Passaic River Study Area |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Estimate of loss exposure in excess of accrual |  |  |  | $ 1,380,000,000 | $ 953,000,000 |  |  |  |  |
Maximum | Lower Passaic River Study Area |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Estimate of loss exposure in excess of accrual |  |  |  | $ 1,730,000,000 |  |  |  |  |  |
Related Party | Crucible Steel Corporation |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation | mi |  |  |  |  |  |  | 17 |  |  |

X
- Definition Accrued Environmental Loss Contingencies, Current, Gross + References No definition available. + Details
Name: | npo_AccruedEnvironmentalLossContingenciesCurrentGross
Namespace Prefix: | npo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount Of Expected Reimbursement By The Government, Percent + References No definition available. + Details
Name: | npo_AmountOfExpectedReimbursementByTheGovernmentPercent
Namespace Prefix: | npo_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag + References No definition available. + Details
Name: | npo_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag
Namespace Prefix: | npo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected Contribution From Government + References No definition available. + Details
Name: | npo_ExpectedContributionFromGovernment
Namespace Prefix: | npo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of sites being investigated by the EPA associated with Crucible environmental matters. + References No definition available. + Details
Name: | npo_InvestigativeSitesNoticeFromTheEPA
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Portion of the environmental site which is subject to remediation + References No definition available. + Details
Name: | npo_PortionOfSiteSubjectToRemediation
Namespace Prefix: | npo_
Data Type: | dtr-types1:lengthItemType
Balance Type: | na
Period Type: | instant

X
- Definition Site Contingency, Focused Feasibility Study, Estimate Of Cost, Development Period + References No definition available. + Details
Name: | npo_SiteContingencyFocusedFeasibilityStudyEstimateOfCostDevelopmentPeriod
Namespace Prefix: | npo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition As determined by a Focused Feasibility Study (FFS), the estimated present value cost necessary to conduct the environmental remediation activities proposed by the FFS. + References No definition available. + Details
Name: | npo_SiteContingencyFocusedFeasibilityStudyEstimateOfCostLowEndOfRange
Namespace Prefix: | npo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of other potentially responsible parties that are participating in the cooperation parties group. + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfOtherPotentiallyResponsibleParties
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of sites subject to various environmental remediation activities. + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivities
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Site Contingency, Number Of Sites Subject To Remediation Activities, Active Operations + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivitiesActiveOperations
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Site Contingency, Number Of Sites Subject To Remediation Activities, Contains Remediation Systems + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivitiesContainsRemediationSystems
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Site Contingency, Number Of Sites Subject To Remediation Activities, Cost In Excess Of 100K + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivitiesCostInExcessOf100K
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of sites at which investigations have been completed to determine environmental remediation activities that may be required. + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivitiesInvestigationCompleted
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of sites subject to various environmental remediation activities. + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivitiesInvestigationInProgress
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Site Contingency, Number Of Sites Subject To Remediation Activities, Monitored + References No definition available. + Details
Name: | npo_SiteContingencyNumberOfSitesSubjectToRemediationActivitiesMonitored
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of other potentially responsible parties that are participating in the cooperation parties group. + References No definition available. + Details
Name: | npo_SiteContingencyNumberofOtherPotentiallyResponsibleParties
Namespace Prefix: | npo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition As determined by a Remedial Investigation Feasibility Study (RI/FS), the estimated present value cost necessary to conduct the environmental remediation activities proposed by the RI/FS + References No definition available. + Details
Name: | npo_SiteContingencyRemedialInvestigationFeasibilityStudyEstimateOfCost
Namespace Prefix: | npo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount by which future environmental remediation costs per site must exceed to be significant enough to be disclosed. + References No definition available. + Details
Name: | npo_SiteContingencySitesSubjectToRemediationActivitiesCostPerSiteDeMinimisThreshold
Namespace Prefix: | npo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481899/410-30-55-16 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-7 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-10 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 + Details
Name: | us-gaap_LossContingencyAccrualPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 5: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481899/410-30-55-11 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481899/410-30-55-16 + Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Best estimate of the reasonably possible loss exposure in excess of the amount accrued for environmental loss contingencies at an individual site. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481931/410-30-50-10 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481899/410-30-55-16 + Details
Name: | us-gaap_SiteContingencyLossExposureInExcessOfAccrualBestEstimate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=npo_LowerPassaicRiverStudyAreaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=npo_UpperNineMilesOfTheRiverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=npo_LowerPassaicRiverStudyAreaLowerEightMilesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=npo_ArizonaUraniumMinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=npo_WaterValleyMississippiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=npo_CrucibleSteelCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |