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Contingent liabilities and commitments (Details) $ in Millions | Mar. 31, 2026 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Guarantee of indebtedness, relating to unused letters of credit | $ 4.9

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- Definition Contingent liabilities for guarantees of consolidated subsidiaries, unused letters of credit. + References No definition available. + Details
Name: | stc_ContingentLiabilitiesForGuaranteesOfConsolidatedSubsidiariesUnusedLettersofCredit
Namespace Prefix: | stc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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