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v3.25.0.1

Leases - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) lease | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Leases [Abstract] |  |  |
Number of leases not yet commenced | lease | 1 |  |
Leases not yet commenced, liability | $ 0.1 |  |
ROU Lease and LHI, Impairment Loss | $ 1.7 | $ 10.0 | $ 2.6

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Number of Contracts + References No definition available. + Details
Name: | stgw_LesseeOperatingLeaseLeaseNotYetCommencedNumberOfContracts
Namespace Prefix: | stgw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Liability + References No definition available. + Details
Name: | stgw_LesseeOperatingLeaseLeaseNotyetCommencedLiability
Namespace Prefix: | stgw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition ROU Lease and LHI, Impairment Loss + References No definition available. + Details
Name: | stgw_ROULeaseAndLHIImpairmentLoss
Namespace Prefix: | stgw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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