Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	$ 1,523,775	$ 1,515,386
Intangible assets with a finite life, accumulated amortization	(678,020)	(571,839)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(41,466)	1,436
Goodwill and intangible assets	804,289	944,983	$ 692,863
Intangible liability - unfavorable service contract
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	(9,533)	(9,533)
Intangible assets with a finite life, accumulated amortization	9,533	9,435
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	0	0
Goodwill and intangible assets	0	(98)
Intangible assets with a finite life
Schedule of Goodwill And Intangible Assets [Line Items]
Intangible assets with a finite life, accumulated amortization	(678,020)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(30,843)
Intangible assets with a finite life | Acquired insurance contracts
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	451,505	451,505
Intangible assets with a finite life, accumulated amortization	(426,202)	(409,592)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	339	339
Goodwill and intangible assets	25,642	42,252
Intangible assets with a finite life | Operating platform
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	52,674	52,674
Intangible assets with a finite life, accumulated amortization	(50,302)	(48,838)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	2	56
Goodwill and intangible assets	2,374	3,892
Intangible assets with a finite life | Distribution relationships
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	602,518	602,518
Intangible assets with a finite life, accumulated amortization	(207,908)	(120,302)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(31,110)	(2,207)
Goodwill and intangible assets	363,500	480,009
Intangible assets with a finite life | Other
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	5,134	5,134
Intangible assets with a finite life, accumulated amortization	(3,141)	(2,542)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(74)	114
Goodwill and intangible assets	1,919	2,706
Goodwill
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	351,231	342,842
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(9,158)	2,023
Goodwill and intangible assets	342,073	344,865
Intangible assets with an indefinite life
Schedule of Goodwill And Intangible Assets [Line Items]
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(1,465)
Intangible assets with an indefinite life | Insurance licenses
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	48,331	48,331
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	0	0
Goodwill and intangible assets	48,331	48,331
Intangible assets with an indefinite life | Syndicate capacity
Schedule of Goodwill And Intangible Assets [Line Items]
Gross balance	21,915	21,915
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(1,465)	1,111
Goodwill and intangible assets	$ 20,450	$ 23,026