SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2025

Segment Reporting [Abstract]

Summary of Underwriting Results of Reportable Segments

The following tables present the underwriting results of the Company's reportable segments, as well as the carrying amounts of allocated goodwill and intangible assets:

	2025									2024
Three months ended and at June 30,	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written	$	1,932,435		$	583,536		$	2,515,971		$	1,814,066		$	626,170		$	2,440,236
Net premiums written	1,290,510			344,924			1,635,434			1,194,197			379,547			1,573,744
Net premiums earned	1,032,961			360,470			1,393,431			958,212			346,266			1,304,478
Other insurance related income (loss)	6			8,656			8,662			(61)			8,587			8,526
Current accident year net losses and loss expenses	(576,986)			(244,997)			(821,983)			(542,591)			(223,397)			(765,988)
Net favorable prior year reserve development	15,216			5,013			20,229			—			—			—
Acquisition costs	(194,912)			(80,985)			(275,897)			(188,026)			(77,065)			(265,091)
Underwriting-related general and administrative expenses	(124,646)			(10,595)			(135,241)			(111,894)			(8,874)			(120,768)
Underwriting income	$	151,639		$	37,562		189,201			$	115,640		$	45,517		161,157
Net investment income							187,297									190,975
Net investment gains (losses)							43,468									(53,479)
Corporate expenses							(25,837)									(27,673)
Foreign exchange (losses) gains							(94,885)									7,384
Interest expense and financing costs							(16,586)									(17,010)
Reorganization expenses							—									(14,014)
Amortization of intangible assets							(2,396)									(2,729)
Income before income taxes and interest in income (loss) of equity method investments							280,262									244,611
Income tax (expense) benefit							(56,199)									(40,547)
Interest in income (loss) of equity method investments							(705)									7,900
Net income							223,358									211,964
Preferred share dividends							7,563									7,563
Net income available to common shareholders							$	215,795								$	204,401
Current accident year loss ratio	55.9		%	68.0		%	59.0		%	56.6		%	64.5		%	58.7		%
Prior year reserve development ratio	(1.5		%)	(1.4		%)	(1.5		%)	—		%	—		%	—		%
Net losses and loss expenses ratio	54.4		%	66.6		%	57.5		%	56.6		%	64.5		%	58.7		%
Acquisition cost ratio	18.9		%	22.5		%	19.8		%	19.6		%	22.3		%	20.3		%
General and administrative expense ratio	12.0		%	2.9		%	11.6		%	11.7		%	2.5		%	11.4		%
Combined ratio	85.3		%	92.0		%	88.9		%	87.9		%	89.3		%	90.4		%
Goodwill and intangible assets	$	237,340		$	—		$	237,340		$	282,227		$	—		$	282,227

	2025									2024
Six months ended and at June 30,	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written	$	3,588,337		$	1,722,285		$	5,310,622		$	3,388,571		$	1,706,092		$	5,094,663
Net premiums written	2,335,090			1,050,383			3,385,473			2,216,551			1,079,266			3,295,817
Net premiums earned	2,043,047			691,204			2,734,251			1,876,159			686,360			2,562,519
Other insurance related income (loss)	162			12,078			12,240			(39)			16,906			16,867
Current accident year net losses and loss expenses	(1,153,052)			(472,793)			(1,625,845)			(1,039,455)			(455,204)			(1,494,659)
Net favorable prior year reserve development	29,194			8,972			38,166			—			—			—
Acquisition costs	(388,933)			(151,544)			(540,477)			(364,055)			(155,290)			(519,345)
Underwriting-related general and administrative expenses	(244,238)			(21,441)			(265,679)			(233,981)			(24,580)			(258,561)
Underwriting income	$	286,180		$	66,476		352,656			$	238,629		$	68,192		306,821
Net investment income							395,009									358,358
Net investment gains (losses)							13,462									(62,687)
Corporate expenses							(54,562)									(53,252)
Foreign exchange (losses) gains							(151,920)									30,936
Interest expense and financing costs							(33,158)									(34,157)
Reorganization expenses							—									(26,312)
Amortization of intangible assets							(5,125)									(5,458)
Income before income taxes and interest in income of equity method investments							516,362									514,249
Income tax (expense) benefit							(100,521)									84,107
Interest in income of equity method investments							1,586									9,069
Net income							417,427									607,425
Preferred share dividends							15,125									15,125
Net income available to common shareholders							$	402,302								$	592,300
Current accident year loss ratio	56.4		%	68.4		%	59.5		%	55.4		%	66.3		%	58.3		%
Prior year reserve development ratio	(1.4)		%	(1.3)		%	(1.4)		%	—		%	—		%	—		%
Net losses and loss expenses ratio	55.0		%	67.1		%	58.1		%	55.4		%	66.3		%	58.3		%
Acquisition cost ratio	19.0		%	21.9		%	19.8		%	19.4		%	22.6		%	20.3		%
General and administrative expense ratio	12.0		%	3.1		%	11.6		%	12.5		%	3.6		%	12.2		%
Combined ratio	86.0		%	92.1		%	89.5		%	87.3		%	92.5		%	90.8		%
Goodwill and intangible assets	$	237,340		$	—		$	237,340		$	282,227		$	—		$	282,227