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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis
The following table presents the financial instruments measured at fair value on a recurring basis:

September 30, 2024
($ in thousands)
Level 1Level 2Level 3Total
Fixed maturities:
U.S. government treasuries$— $764,928 $— $764,928 
U.S. states, territories and municipalities— 13,467 — 13,467 
Non-U.S. sovereign governments and supranationals— 77,176 — 77,176 
Corporate— 1,133,797 — 1,133,797 
Residential mortgage-backed securities - Agency— 251,514 — 251,514 
Residential mortgage-backed securities - Non-agency— 5,359 — 5,359 
Commercial mortgage-backed securities - Non-agency— 33,109 — 33,109 
Other asset-backed securities— 40,834 — 40,834 
Total fixed maturities— 2,320,184 — 2,320,184 
Short-term investments— 507,947 — 507,947 
Total$— $2,828,131 $— $2,828,131 

December 31, 2023
($ in thousands)
Level 1Level 2Level 3Total
Fixed maturities:
U.S. government treasuries$— $708,250 $— $708,250 
U.S. states, territories and municipalities— 4,370 — 4,370 
Non-U.S. sovereign governments and supranationals— 56,246 — 56,246 
Corporate— 863,876 — 863,876 
Residential mortgage-backed securities - Agency— 168,513 — 168,513 
Residential mortgage-backed securities - Non-agency— 4,984 — 4,984 
Commercial mortgage-backed securities - Non-agency— 10,423 — 10,423 
Other asset-backed securities— 14,606 — 14,606 
Total fixed maturities— 1,831,268 — 1,831,268 
Short-term investments— 428,878 — 428,878 
Total$— $2,260,146 $— $2,260,146