XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.23.3

Debt - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 20, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Aug. 02, 2021
Debt [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 640.0 |  | $ 640.0 |  | $ 500.0 |  |
Line of Credit Facility, Increase (Decrease), Net |  | 140.0 |  |  |  |  |  |
Maximum Restricted Payments under Credit Facility |  | 150.0 |  | 150.0 |  |  |  |
Interest and Debt Expense |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Interest expense, long-term debt |  | 25.3 | $ 19.0 | 65.9 | $ 54.9 |  |  |
Amortization of debt issuance costs |  | 0.7 | $ 0.6 | $ 2.5 | $ 1.8 |  |  |
Line of Credit | Combined Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Higher borrowing capacity option |  |  |  |  |  |  |  | $ 15.0
Secured Debt | Combined Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Long-term debt, term |  |  |  |  |  |  |  | 5 years
Higher borrowing capacity option |  |  |  |  |  |  |  | $ 100.0
Secured Debt | Combined Credit Agreement | Revolving Credit Facility | United Kingdom, Pounds |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Higher borrowing capacity option |  |  |  |  |  |  |  | 50.0
Secured Debt | Combined Credit Agreement | Revolving Credit Facility | Euro Member Countries, Euro |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Higher borrowing capacity option |  |  |  |  |  |  |  | 50.0
Secured Debt | Combined Credit Agreement | Revolving Credit Facility | Federal Funds |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Variable rate |  |  |  | 0.50% |  |  |  |
Secured Debt | Combined Credit Agreement | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Variable rate |  |  |  | 1.00% |  |  |  |
Secured Debt | Combined Credit Agreement | Revolving Credit Facility | us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Variable rate |  |  |  | 0.10% |  |  |  |
Letter of Credit | Combined Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 24.9 |  | $ 24.9 |  |  | $ 25.3 |
Standby Letters of Credit | Combined Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 50.0
Senior Notes | 5.625% Notes |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,100.0 |  |  |  |  |  |  |
Interest rate, stated percentage | 5.625% |  |  |  |  |  |  |
Percentage of principal amount redeemed | 40.00% |  |  |  |  |  |  |
Percentage of redemption price, change in ownership controllatest for redemption at face amount | 101.00% |  |  |  |  |  |  |
Percentage of redemption price, sale of certain assets | 100.00% |  |  |  |  |  |  |
Senior Notes | 5.625% Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |
Senior Notes | 5.625% Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage | 102.813% |  |  |  |  |  |  |
Senior Notes | 5.625% Notes | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage | 101.406% |  |  |  |  |  |  |
Senior Notes | 5.625% Notes | Debt Instrument, Redemption, Period Four |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |
Senior Notes | 5.625% Notes | Debt Instrument, Redemption With Equity Offering proceeds, Period One |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |
Redemption price, percentage | 105.625% |  |  |  |  |  |  |

X
- Definition The percentage of the face amount of the debt instrument applicable to the change in ownership. + References No definition available. + Details
Name: | stgw_DebtInstrumentPercentageOfRedemptionPriceChangeInOwnershipControl
Namespace Prefix: | stgw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Percentage Of Redemption Price, Sale Of Certain Assets + References No definition available. + Details
Name: | stgw_DebtInstrumentPercentageOfRedemptionPriceSaleOfCertainAssets
Namespace Prefix: | stgw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | stgw_DebtLineItems
Namespace Prefix: | stgw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option + References No definition available. + Details
Name: | stgw_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption
Namespace Prefix: | stgw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum Restricted Payments under Credit Facility + References No definition available. + Details
Name: | stgw_MaximumRestrictedPaymentsUnderCreditFacility
Namespace Prefix: | stgw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
Name: | us-gaap_AmortizationOfFinancingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI https://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate amount of interest expense on all borrowings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7,8) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_InterestExpenseBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_LongTermDebtTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=stgw_InterestAndDebtExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=stgw_CombinedCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=stgw_FederalFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=stgw_AdjustedTermSOFRRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=stgw_FivePointSixTwoFivePercentSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=stgw_DebtInstrumentRedemptionWithEquityOfferingProceedsPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |