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Fair Value Measurements - Recurring (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Fair value balance sheet items measured on a recurring basis |  |
Mortgage loans held for sale | $ 796.5 | $ 796.4
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities collateralized by residential real estate | 3.9 | 3.9
Fair value balance sheet items measured on a recurring basis |  |
Mortgage loans held for sale | 792.8 | 792.4
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Interest rate lock commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 19.8 | 10.5
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Forward sales of MBS [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | (8.0) | 3.3
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Best-efforts and mandatory commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | (0.8) | 0.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities collateralized by residential real estate | 0.0 | 0.0
Fair value balance sheet items measured on a recurring basis |  |
Mortgage loans held for sale | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest rate lock commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Forward sales of MBS [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Best-efforts and mandatory commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities collateralized by residential real estate | 0.0 | 0.0
Fair value balance sheet items measured on a recurring basis |  |
Mortgage loans held for sale | 784.4 | 784.6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate lock commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 19.8 | 10.5
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward sales of MBS [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | (8.0) | 3.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Best-efforts and mandatory commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | (0.8) | 0.2
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities collateralized by residential real estate | 3.9 | 3.9
Fair value balance sheet items measured on a recurring basis |  |
Mortgage loans held for sale | 8.4 | 7.8
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Forward sales of MBS [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Best-efforts and mandatory commitments [Member] |  |
Fair value balance sheet items measured on a recurring basis |  |
Fair value of interest rate derivatives | $ 0.0 | $ 0.0

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- Definition Fair value as of the balance sheet date of all derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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