v3.25.2
Investment Securities - Cost and Amortized Cost Maturity Schedule (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fixed Maturities, Excluding Asset-Backed Securities And Collateralized Loan Obligations    
Cost or Amortized Cost    
Due in one year or less $ 399.9 $ 205.8
Due after one year through five years 1,370.0 1,494.5
Due after five years through ten years 149.7 206.1
Due after ten years 9.8 25.3
Carrying Value    
Due in one year or less 398.2 203.9
Due after one year through five years 1,371.4 1,478.7
Due after five years through ten years 147.1 193.2
Due after ten years 9.9 25.2
Mortgage and asset-backed securities and collateralized loan obligations    
Cost or Amortized Cost    
Mortgage and asset-backed securities and collateralized loan obligations 724.9 637.5
Carrying Value    
Mortgage and asset-backed securities and collateralized loan obligations 709.3 610.6
Fixed maturity investments    
Cost or Amortized Cost    
Total fixed maturity investments 2,654.3 2,569.2
Carrying Value    
Total fixed maturity investments $ 2,635.9 $ 2,511.6