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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Mortgage loans held for sale | $ 1,529.0 | $ 1,072.0 |
Mortgage servicing rights | 17.1 | 0.0 |
Debt Securities [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net realized and unrealized gains (losses) | 0.0 | 0.0 |
Purchases | 0.0 | 0.0 |
Sales and Settlements | 0.0 | 0.0 |
Principal Reductions | 0.0 | 0.0 |
Net transfers to (out of) Level 3 | 0.0 | 0.0 |
Loans Receivable [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net realized and unrealized gains (losses) | 0.2 | 0.9 |
Purchases | 0.0 | 0.0 |
Sales and Settlements | (2.6) | (5.4) |
Principal Reductions | 0.0 | 0.0 |
Net transfers to (out of) Level 3 | 7.7 | 6.5 |
Contractual Rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Net realized and unrealized gains (losses) | 1.9 |  |
Purchases | 15.2 |  |
Sales and Settlements | 0.0 |  |
Principal Reductions | 0.0 |  |
Net transfers to (out of) Level 3 | 0.0 |  |
Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Mortgage loans held for sale | 15.1 | 9.8 | $ 7.8
Debt securities collateralized by residential real estate | 3.9 | 3.9 | $ 3.9
Mortgage servicing rights | $ 17.1 | $ 0.0 |
Minimum [Member] | Measurement Input, Discount Rate [Member] | Inventories [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Other Real Estate Owned, Measurement Input | 0.16 |  |
Maximum [Member] | Measurement Input, Discount Rate [Member] | Inventories [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Other Real Estate Owned, Measurement Input | 0.18 |  |

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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=121593590&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=120238483&loc=d3e48678-111004 + Details
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