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Investment Securities - Narrative (Details) - USD ($) $ in Millions		9 Months Ended
	Jun. 01, 2022	Sep. 30, 2024
Schedule of Held-to-maturity Securities [Line Items]
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax	$ 218.3	$ (163.9)
Held-to-maturity Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities loaned, fair value of collateral		2,200.0
Debt Securities, Held-to-Maturity, Restricted		2,200.0
Transfer to Investments	$ 2,300.0
Available-for-sale Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities loaned, fair value of collateral		$ 4.3

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