v3.25.1
Investment Securities - Cost and Amortized Cost Maturity Schedule (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fixed Maturities, Excluding Asset-Backed Securities And Collateralized Loan Obligations    
Cost or Amortized Cost    
Due in one year or less $ 318.7 $ 205.8
Due after one year through five years 1,374.7 1,494.5
Due after five years through ten years 219.8 206.1
Due after ten years 17.9 25.3
Carrying Value    
Due in one year or less 316.4 203.9
Due after one year through five years 1,370.2 1,478.7
Due after five years through ten years 211.4 193.2
Due after ten years 18.1 25.2
Mortgage and asset-backed securities and collateralized loan obligations    
Cost or Amortized Cost    
Mortgage and asset-backed securities and collateralized loan obligations 656.3 637.5
Carrying Value    
Mortgage and asset-backed securities and collateralized loan obligations 635.9 610.6
Fixed maturity investments    
Cost or Amortized Cost    
Total fixed maturity investments 2,587.4 2,569.2
Carrying Value    
Total fixed maturity investments $ 2,552.0 $ 2,511.6