Deferred Acquisition Consideration (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2024	Sep. 30, 2024	Dec. 31, 2023	Jul. 31, 2023	Oct. 01, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments	$ 101,058	$ 101,058	$ 161,323
Payments		61,044	97,447
Adjustments to deferred acquisition consideration (2)		13,971	14,303
Additions		7,201	22,172
Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss)		487	680
Other		0	27
Ending balance of contingent payments		61,673	101,058
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		61,673	101,058
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases		7,201	22,172
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		(61,044)	(97,447)
Targeted Victory
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Additions			22,200
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases			22,200
Business Acquisition, Percentage of Voting Interests Acquired					26.70%
Business Acquisition, Percentage of Voting Interests Acquired, Step One & Two				50.00%	50.00%
Contingent Payment
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments	57,500	57,500
Ending balance of contingent payments		61,600	57,500
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		61,600	57,500
Fixed payments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments	43,600	43,600
Ending balance of contingent payments		0	43,600
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		0	43,600
Common Class A
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of contingent payments	29,300	29,300
Payments	(32,800)	(18,200)
Ending balance of contingent payments		21,200	29,300
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		21,200	$ 29,300
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	$ 32,800	$ 18,200