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Fair Value Measurements - Nonrecurring Bais (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | $ 1,644.1 | $ 1,529.0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Restricted cash, Fair value | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | 0.6 | 1.5
Loans Receivable, Fair Value Disclosure | 2.7 | 0.6
Restricted cash, Fair value | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Restricted cash, Fair value | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | 0.6 | 2.2
Loans Receivable, Fair Value Disclosure | 1.3 | 2.0
Restricted cash, Fair value | $ 0.2 | $ 0.0

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + 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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