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Mortgage Loans Mortgage Loans Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Mortgage loans held for sale | $ 2,242.8 |  | $ 2,242.8 |  | $ 2,027.3
Mortgage loans held for sale, outstanding principal amount | 2,270.0 |  | 2,270.0 |  | 1,970.0
Payments for Origination of Mortgage Loans Held-for-sale |  |  | 8,400.0 | $ 7,300.0 |
Proceeds from Sale of Mortgage Loans Held-for-sale |  |  | 8,100.0 | 7,000.0 |
Gain (Loss) on Sales of Loans, Net | 168.0 | $ 178.6 | 302.0 | $ 317.4 |
Interest rate lock commitments [Member] |  |  |  |  |
Derivative, Notional Amount | 3,700.0 |  | $ 3,700.0 |  | 1,500.0
Loans Sold to FNMA or securities backed by GNMA [Member] | Customer Concentration Risk | Mortgage Loans |  |  |  |  |
Concentration Risk, Percentage |  |  | 68.00% |  |
Other Customer [Member] | Customer Concentration Risk | Mortgage Loans |  |  |  |  |
Concentration Risk, Percentage |  |  | 24.00% |  |
Loan Origination Commitments [Member] |  |  |  |  |
Derivative, Notional Amount | 784.2 |  | $ 784.2 |  | 834.6
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 | $ 9.8 |  | $ 9.8 |  | $ 1.1

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004 + Details
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- Definition The amount of cash paid for the origination of mortgages that are held for sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3461-108585 + Details
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