v3.26.3
Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations        
Amount of gain (loss) recognized in net income on derivatives $ 601.8 $ (432.8) $ 445.8 $ (1,083.8)
Interest rate contracts        
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations        
Amount of gain (loss) recognized in net income on derivatives 15.8 (13.6) 18.6 (200.2)
Foreign exchange contracts        
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations        
Amount of gain (loss) recognized in net income on derivatives 7.0 (24.7) 20.5 (8.7)
Equity contracts        
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations        
Amount of gain (loss) recognized in net income on derivatives 57.4 217.5 536.1 239.8
Credit contracts        
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations        
Amount of gain (loss) recognized in net income on derivatives (6.5) 19.1 1.8 (9.0)
Other contracts        
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations        
Amount of gain (loss) recognized in net income on derivatives $ 528.1 $ (631.1) $ (131.2) $ (1,105.7)