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Basis of Presentation and Recent Developments (Details) € in Millions, £ in Millions, R$ in Millions, $ in Millions											3 Months Ended			9 Months Ended
	Jul. 19, 2024 USD ($) shares	Apr. 05, 2024 USD ($) shares	Apr. 05, 2024 BRL (R$) shares	Apr. 04, 2024 USD ($)	Apr. 04, 2024 EUR (€)	Mar. 01, 2024 USD ($) shares	Mar. 01, 2024 GBP (£) shares	Jan. 02, 2024 USD ($) shares	Nov. 01, 2023 USD ($) shares	Oct. 02, 2023 USD ($) shares	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023	Apr. 05, 2024 BRL (R$)	Apr. 04, 2024 EUR (€)	Mar. 01, 2024 GBP (£)
Business Acquisition [Line Items]
Income Tax Expense Adjustment											$ 10.4	$ 5.3	$ 7.3
Income Tax Expense Adjustment											$ 10.4	$ 5.3	$ 7.3
income tax expense
Business Acquisition [Line Items]
Immaterial Error Correction														2.1 million
Income tax receivable and payable
Business Acquisition [Line Items]
Immaterial Error Correction												12.9 million
Accumulated Other Comprehensive Income (Loss), Net of Tax
Business Acquisition [Line Items]
Immaterial Error Correction														23.5 million
Income tax payable
Business Acquisition [Line Items]
Immaterial Error Correction														2.4 million
Deferred tax asset
Business Acquisition [Line Items]
Immaterial Error Correction														4.5 million
Tax receivable agreement
Business Acquisition [Line Items]
Immaterial Error Correction											2.1 million
Left Field Labs
Business Acquisition [Line Items]
Aggregate purchase price										$ 13.2
Payments to Acquire Businesses, Gross										$ 9.4
Shares issued by the Company (shares) | shares										825,402
Deferred acquisition consideration										$ 51.0
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned										$ 3.8
Movers and Shakers LLC
Business Acquisition [Line Items]
Aggregate purchase price									$ 14.7
Payments to Acquire Businesses, Gross									10.2
Deferred acquisition consideration									35.0
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned									$ 4.5
Movers and Shakers LLC | Common Class A
Business Acquisition [Line Items]
Shares issued by the Company (shares) | shares									1,000,000
Team Epiphany
Business Acquisition [Line Items]
Aggregate purchase price								$ 15.8
Payments to Acquire Businesses, Gross								$ 10.8
Shares issued by the Company (shares) | shares								797,916
Deferred acquisition consideration								$ 17.0
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned								$ 5.0
Sidekick Live Limited
Business Acquisition [Line Items]
Aggregate purchase price						$ 6.0	£ 4.6
Payments to Acquire Businesses, Gross						$ 5.0	£ 3.6
Shares issued by the Company (shares) | shares						195,431	195,431
Deferred acquisition consideration						$ 10.0											£ 8.0
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned						$ 1.0											£ 0.9
What's Next Partners
Business Acquisition [Line Items]
Aggregate purchase price				$ 5.0	€ 4.3
Deferred acquisition consideration				$ 9.0												€ 8.5
PROS Agency
Business Acquisition [Line Items]
Aggregate purchase price		$ 9.0	R$ 42.1
Payments to Acquire Businesses, Gross		$ 5.0	R$ 23.3
Shares issued by the Company (shares) | shares		182,256	182,256
Deferred acquisition consideration		$ 14.0													R$ 72.5
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 1.0													R$ 5.3
Leaders | Subsequent event
Business Acquisition [Line Items]
Aggregate purchase price	$ 3.8
Payments to Acquire Businesses, Gross	$ 2.9
Shares issued by the Company (shares) | shares	135,010
Deferred acquisition consideration	$ 6.6
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 0.9

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