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Derivative Financial Instruments - Net Change in Net Unrealized Gains (Losses) to Derivative Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Credit default swaps      
Derivative [Line Items]      
Net realized gains/(losses) $ 0.0 $ 0.0 $ 0.0
Change in net unrealized gains/(losses) 0.0 0.0 0.0
Forwards      
Derivative [Line Items]      
Net realized gains/(losses) (16.4) (3.6) 3.8
Change in net unrealized gains/(losses) $ (1.3) $ 0.6 $ (7.3)