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Investment Securities - Cost and Amortized Cost Maturity Schedule (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Cost or Amortized Cost  
Total fixed maturity investments $ 2,077.3
Carrying Value  
Total fixed maturity investments 1,940.7
Fixed Maturities and Convertible Fixed Maturities Excluding Mortgage Backed Securities  
Cost or Amortized Cost  
Due in one year or less 276.3
Due after one year through five years 876.2
Due after five years through ten years 311.7
Due after ten years 98.8
Carrying Value  
Due in one year or less 269.7
Due after one year through five years 819.9
Due after five years through ten years 285.0
Due after ten years 90.3
Mortgage and asset-backed securities  
Cost or Amortized Cost  
Mortgage and asset-backed securities and collateralized loan obligations 514.3
Carrying Value  
Mortgage and asset-backed securities and collateralized loan obligations $ 475.8