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Deposits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deposit [Abstract]    
Non-interest-bearing demand $ 21,353.4 $ 13,463.3
Certificates of Deposit, CDARS 729.2 496.4
Non-interest-bearing demand 10,800.0 5,900.0
Time Deposit Maturities, Next Twelve Months 1,932.4  
Time Deposit Maturities, Year Two 102.2  
Time Deposit Maturities, Year Three 17.4  
Time Deposit Maturities, Year Four 2.9  
Time Deposit Maturities, Year Five 1.1  
Time Deposits 2,056.0  
Interest Bearing Deposit Demand 6,924.0 4,396.4
Deposits, Savings Deposits 17,278.6 12,413.4
Time Deposits, $250,000 or more 523.0 602.0
Time Deposits, Less than $250,000 1,533.0 1,055.4
Total deposits 47,612.0 31,930.5
Deposits, ICS 1,800.0 1,300.0
Deposits, Wholesale 1,800.0 554.8
Deposits costs, deposits with earnings credits $ 27.4 $ 17.0