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Basis of Presentation and Recent Developments (Details) £ in Millions, R$ in Millions, $ in Millions										3 Months Ended			6 Months Ended
	Apr. 05, 2024 USD ($) shares	Apr. 05, 2024 BRL (R$) shares	Apr. 03, 2024 USD ($)	Apr. 03, 2024 GBP (£)	Mar. 01, 2024 USD ($) shares	Mar. 01, 2024 GBP (£) shares	Jan. 02, 2024 USD ($) shares	Nov. 01, 2023 USD ($) shares	Oct. 02, 2023 USD ($) shares	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023	Apr. 05, 2024 BRL (R$)	Apr. 03, 2024 GBP (£)	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 | Subsequent event
Business Acquisition [Line Items]
Aggregate purchase price			$ 5.0	£ 4.3
Deferred acquisition consideration			$ 9.0												£ 8.5
PROS Agency | Subsequent event
Business Acquisition [Line Items]
Aggregate purchase price	$ 5.0	R$ 26.5
Payments to Acquire Businesses, Gross	4.0	R$ 21.2
Deferred acquisition consideration	14.0													R$ 72.5
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 1.0													R$ 5.3
PROS Agency | Common Class A | Subsequent event
Business Acquisition [Line Items]
Shares issued by the Company (shares) | shares	182,256	182,256

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