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Investment Securities - Maturity Dates Of Available-For-Sale Securities (Details) $ in Millions	Jun. 30, 2024 USD ($)
Amortized Cost
Due within one year	$ 117.9
Due after 1 year through year 5	739.9
Due after 5 years through year 10	973.5
Due after 10 years	1,633.8
Amortized Cost	3,465.1
Fair Value
Due within one year	115.9
Due after 1 year through year 5	696.8
Due after 5 years through year 10	948.3
Due after 10 years	1,588.9
Fair Value	$ 3,349.9

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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