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Fair Value Measurements - Recurring (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016
--- | --- | --- | --- | ---
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | $ 679.9 | $ 587.3 |  |
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 | 8.8 | 8.8 |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 676.9 | 585.8 |  |
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 | 17.1 | 9.4 |  |
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 | (3.2) | 1.1 |  |
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 | (0.3) | 0.6 |  |
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 | 670.3 | 580.2 |  |
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 | 17.1 | 9.4 |  |
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 | (3.2) | 1.1 |  |
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 | (0.3) | 0.6 |  |
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 | 8.8 | 8.8 | $ 8.8 | $ 0.0
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | 6.6 | 5.6 | $ 5.3 | $ 6.8
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 |  |
Homebuilding [Member] |  |  |  |
Fair value balance sheet items measured on a recurring basis |  |  |  |
Mortgage loans held for sale | $ 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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