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Investment Securities - Cost and Amortized Cost Maturity Schedule (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fixed Maturities, Excluding Asset-Backed Securities And Collateralized Loan Obligations    
Cost or Amortized Cost    
Due in one year or less $ 307.6  
Due after one year through five years 870.9  
Due after five years through ten years 302.7  
Due after ten years 92.3  
Carrying Value    
Due in one year or less 301.2  
Due after one year through five years 813.4  
Due after five years through ten years 267.6  
Due after ten years 78.7  
Mortgage and asset-backed securities and collateralized loan obligations    
Cost or Amortized Cost    
Mortgage and asset-backed securities and collateralized loan obligations 569.1  
Carrying Value    
Mortgage and asset-backed securities and collateralized loan obligations 517.0  
Fixed maturity investments    
Cost or Amortized Cost    
Total fixed maturity investments 2,142.6 $ 2,076.0
Carrying Value    
Total fixed maturity investments $ 1,977.9 $ 1,920.9