v3.26.1
Valuation of Financial Instruments Investments at NAV (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value investments entities that calculate net asset value per share liquidating investment original expected lives increments 1 year  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 9.7  
Cash Equivalents Measured at Net Asset Value 59.0 $ 110.9
Other invested assets at NAV $ 96.1 $ 96.5
Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 12 years  
Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 3 years