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Investment Securities - Investment Holdings Fixed Maturity Table (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
U.S. Government and agency obligations    
Debt and Equity Securities, FV-NI [Line Items]    
Cost or Amortized Cost $ 227.6 $ 216.6
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (9.4) (10.2)
Net Foreign Currency Gains (Losses) 0.0 0.0
Carrying Value 218.2 206.4
Debt securities issued by corporations    
Debt and Equity Securities, FV-NI [Line Items]    
Cost or Amortized Cost 1,061.8 1,098.3
Gross Unrealized Gains 0.3 0.6
Gross Unrealized Losses (67.9) (78.3)
Net Foreign Currency Gains (Losses) (1.7) (1.8)
Carrying Value 992.5 1,018.8
Municipal obligations    
Debt and Equity Securities, FV-NI [Line Items]    
Cost or Amortized Cost 273.6 281.6
Gross Unrealized Gains 0.0 0.4
Gross Unrealized Losses (19.4) (23.4)
Net Foreign Currency Gains (Losses) 0.0 0.0
Carrying Value 254.2 258.6
Mortgage and asset-backed securities    
Debt and Equity Securities, FV-NI [Line Items]    
Cost or Amortized Cost 321.9 288.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (33.9) (34.5)
Net Foreign Currency Gains (Losses) 0.0 0.0
Carrying Value 288.0 254.2
Collateralized loan obligations    
Debt and Equity Securities, FV-NI [Line Items]    
Cost or Amortized Cost 192.4 190.8
Gross Unrealized Gains 0.2 0.1
Gross Unrealized Losses (3.6) (6.0)
Net Foreign Currency Gains (Losses) (1.2) (2.0)
Carrying Value 187.8 182.9
Total fixed maturity investments    
Debt and Equity Securities, FV-NI [Line Items]    
Cost or Amortized Cost 2,077.3 2,076.0
Gross Unrealized Gains 0.5 1.1
Gross Unrealized Losses (134.2) (152.4)
Net Foreign Currency Gains (Losses) (2.9) (3.8)
Carrying Value $ 1,940.7 $ 1,920.9