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Mortgage Loans Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgage loans held for sale	$ 2,680.8		$ 2,680.8		$ 2,566.5
Mortgage loans held for sale, outstanding principal amount	2,800.0		2,800.0		2,700.0
Payments for Origination of Mortgage Loans Held-for-sale			10,300.0	$ 10,500.0
Proceeds from Sale of Mortgage Loans Held-for-sale			10,200.0	10,500.0
Gain (Loss) on Sales of Loans, Net	127.8	$ 151.1	$ 251.8	$ 271.1
Loans Sold to FNMA, FHLMC or securities backed by GNMA [Member] \| Customer Concentration Risk \| Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Concentration Risk, Percentage			72.00%
Other Customer [Member] \| Customer Concentration Risk \| Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Concentration Risk, Percentage			19.00%
Loan Origination Commitments [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Derivative, Notional Amount	1,100.0		$ 1,100.0		677.5
Fair Value, Inputs, Level 3 [Member] \| Interest rate lock commitments [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Derivative, Notional Amount	3,400.0		3,400.0		2,100.0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Loan Origination Commitments [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ (0.1)		$ (0.1)		$ 1.9