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Mortgage Loans Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Mortgage loans held for sale | $ 2,672.4 |  | $ 2,672.4 |  | $ 2,519.9
Mortgage loans held for sale, outstanding principal amount | 2,700.0 |  | 2,700.0 |  | 2,600.0
Payments for Origination of Mortgage Loans Held-for-sale |  |  | 11,300.0 | $ 9,600.0 |
Proceeds from Sale of Mortgage Loans Held-for-sale |  |  | 11,100.0 | 9,900.0 |
Gain (Loss) on Sales of Loans, Net | 152.7 | $ 154.5 | $ 281.5 | $ 233.8 |
Loans Sold to FNMA or securities backed by GNMA [Member] | Customer Concentration Risk | Mortgage Loans |  |  |  |  |
Concentration Risk, Percentage |  |  | 71.00% |  |
Other Customer [Member] | Customer Concentration Risk | Mortgage Loans |  |  |  |  |
Concentration Risk, Percentage |  |  | 28.00% |  |
Loan Origination Commitments [Member] |  |  |  |  |
Derivative, Notional Amount | 620.5 |  | $ 620.5 |  | 1,100.0
Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments [Member] |  |  |  |  |
Derivative, Notional Amount | 3,000.0 |  | 3,000.0 |  | 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 | $ (0.1) |  | $ (0.1) |  | $ 15.7

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(h)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477011/948-310-45-1 + Details
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