Segments - Schedule of Premiums Written (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Effects of Reinsurance [Line Items]
Total gross written premiums	$ 740,554	$ 584,914	$ 1,408,258	$ 1,120,240
Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	667,773	584,914	1,249,577	1,120,240
Apollo Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	72,781		158,681
Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	667,919	585,578	1,248,810	1,118,499
Corporate Nonsegment \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	(146)	(664)	767	1,741
Accident & Health \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	95,456	60,489	187,465	123,658
Captives \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	64,251	76,994	122,165	143,923
Credit & Surety \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	63,759	55,131	127,933	100,159
Energy Solutions \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	62,690	74,822	111,556	150,416
Global Agriculture \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	111,939	57,179	214,291	137,796
Global Property \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	71,109	83,992	105,626	130,678
Professional Lines \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	34,978	37,555	71,206	77,772
Specialty Programs \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	111,441	85,955	206,208	148,630
Transactional E&S \| Operating Segments \| Skyward Specialty Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	52,296	$ 53,461	102,360	$ 105,467
Syndicate 1969 \| Apollo Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	59,431		124,439
Syndicate 1971 \| Apollo Segment
Effects of Reinsurance [Line Items]
Total gross written premiums	$ 13,350		$ 34,242