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v3.25.4

Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Effect of tax rate portion in state tax | 50.00% | 50.00% | 50.00%

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- Definition Effect of tax rate portion in state tax. + References No definition available. + Details
Name: | iosp_EffectOfTaxRatePortionInStateTax
Namespace Prefix: | iosp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration