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Mortgage Loans Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Mortgage loans held for sale	$ 2,578.8		$ 2,578.8		$ 2,519.9
Mortgage loans held for sale, outstanding principal amount	2,600.0		2,600.0		2,600.0
Payments for Origination of Mortgage Loans Held-for-sale			17,700.0	$ 15,300.0
Proceeds from Sale of Mortgage Loans Held-for-sale			17,700.0	15,300.0
Gain (Loss) on Sales of Loans, Net	162.6	$ 157.9	$ 444.0	$ 391.6
Loans Sold to FNMA or securities backed by GNMA [Member] | Customer Concentration Risk | Mortgage Loans
Concentration Risk, Percentage			73.00%
Other Customer [Member] | Customer Concentration Risk | Mortgage Loans
Concentration Risk, Percentage			26.00%
Loan Origination Commitments [Member]
Derivative, Notional Amount	748.4		$ 748.4		1,100.0
Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments [Member]
Derivative, Notional Amount	2,900.0		2,900.0		2,700.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loan Origination Commitments [Member]
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 4.8		$ 4.8		$ 15.7

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Nominal or face amount used to calculate payment on derivative.

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The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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The amount of cash paid for the origination of mortgages that are held for sale.

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This is the principal amount outstanding for loans which are in the process of being securitized as of the date of the statement of financial position (across all types of loans).

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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