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Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effect of derivatives not designated as hedging instruments on the consolidated statements of operations      
Amount of gain (loss) recognized in net income on derivatives $ (146.2) $ 50.9 $ (145.2)
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 (46.6) 346.5 218.0
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 (121.9) 54.7 (58.6)
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 (81.5) (96.6) (132.9)
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 0.1 1.8 (3.6)
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 $ 103.7 $ (255.5) $ (168.1)