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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Mortgage loans held for sale | $ 538.2 |  | $ 587.3 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Mortgage loans held for sale | 7.2 | $ 7.7 | 5.6 | $ 6.8
Debt securities collateralized by residential real estate | 8.8 |  | 8.8 |
Loans Receivable [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Net realized and unrealized gains (losses) | (0.1) | 0.0 |  |
Purchases | 0.0 | 0.0 |  |
Sales and Settlements | (0.5) | 0.0 |  |
Principal Reductions | 0.0 | 0.0 |  |
Net transfers to (out of) Level 3 | 2.2 | $ 0.9 |  |
Debt Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Net realized and unrealized gains (losses) | 0.0 |  |  |
Purchases | 0.0 |  |  |
Sales and Settlements | 0.0 |  |  |
Principal Reductions | 0.0 |  |  |
Net transfers to (out of) Level 3 | 0.0 |  |  |
Homebuilding [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Mortgage loans held for sale | $ 0.0 |  | $ 0.0 |

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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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