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Business Combinations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 19, 2024
Jun. 30, 2024
Jun. 30, 2024
Business Acquisition [Line Items]      
Entity shares issued (in shares) 1.0192    
Business combination, acquisition related costs   $ 31.0 $ 31.0
Discover | Series D Preferred Stock      
Business Acquisition [Line Items]      
Per annum dividend rate 6.125%