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v3.23.3

Leases - Additional Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($) lease
Leases [Abstract] |
Number of leases not yet commenced | lease | 3
Leases not yet commenced, liability | $ 6.0
ROU Lease and LHI, Impairment Loss | $ 9.2

X
- 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