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Mortgage Loans Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Mortgage loans held for sale | $ 2,767.7 |  | $ 2,767.7 |  | $ 2,477.5
Mortgage loans held for sale, outstanding principal amount | 2,860.0 |  | 2,860.0 |  | 2,490.0
Payments for Origination of Mortgage Loans Held-for-sale |  |  | 17,080.0 | $ 17,730.0 |
Proceeds from Sale of Mortgage Loans Held-for-sale |  |  | 16,680.0 | 17,680.0 |
Gain (Loss) on Sales of Loans, Net | 152.8 | $ 162.6 | $ 423.9 | $ 444.0 |
Loans Sold to FNMA, FHLMC or securities backed by GNMA [Member] | Customer Concentration Risk | Mortgage Loans |  |  |  |  |
Concentration Risk, Percentage |  |  | 72.00% |  |
Other Customer [Member] | Customer Concentration Risk | Mortgage Loans |  |  |  |  |
Concentration Risk, Percentage |  |  | 26.00% |  |
Loan Origination Commitments [Member] |  |  |  |  |
Derivative, Notional Amount | 880.5 |  | $ 880.5 |  | 637.9
Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments [Member] |  |  |  |  |
Derivative, Notional Amount | 2,700.0 |  | 2,700.0 |  | 2,000.0
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 | $ (6.8) |  | $ (6.8) |  | $ 2.4

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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