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Investment Securities - Maturity Dates Of Available-For-Sale Securities (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Amortized Cost  
Due within one year $ 56.9
Due after 1 year through year 5 612.1
Due after 5 years through year 10 771.0
Due after 10 years 1,364.3
Amortized Cost 2,804.3
Fair Value  
Due within one year 55.6
Due after 1 year through year 5 565.5
Due after 5 years through year 10 719.3
Due after 10 years 1,314.9
Fair Value $ 2,655.3