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Contingent liabilities and commitments (Details) $ in Millions	Mar. 31, 2025 USD ($)
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