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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2015 | Dec. 31, 2012 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Proceeds from sale (purchases) of debt securities collateralized by residential real estate | $ 35.8 |  |  |  |  |  |
Payments to Acquire Other Investments |  |  | $ 18.6 |  |  |  |
Payments to Acquire Land |  | $ 19.9 |  |  |  |  |
Gain (Loss) on Sale of Debt Investments |  |  |  | $ 0.0 | $ 4.5 |  |
Debt Securities [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Payments to Acquire Land |  | 14.8 |  |  |  |  |
Land [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Payments to Acquire Land |  | $ 5.1 |  |  |  |  |
Financial Services and Other [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Mortgage loans held for sale |  |  |  | 577.8 |  | $ 654.0 |
Financial Services and Other [Member] | 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 | 15.3 |  |  | 8.4 | 15.3 | 6.8 | $ 13.9
Financial Services and Other [Member] | Loans Receivable [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Net realized and unrealized gains (losses) |  |  |  | (0.1) | 1.0 |  |
Purchases |  |  |  | 0.0 | 0.0 |  |
Sales and Settlements |  |  |  | (1.7) | (10.2) |  |
Principal Reductions |  |  |  | 0.0 | 0.0 |  |
Net transfers to (out of) Level 3 |  |  |  | 3.4 | 10.6 |  |
Homebuilding [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Debt securities collateralized by residential real estate | $ 0.0 |  |  | 3.9 | 0.0 | $ 0.0 | $ 33.9
Homebuilding [Member] | Debt Securities [Member] |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Net realized and unrealized gains (losses) |  |  |  | 0.0 | 2.2 |  |
Purchases |  |  |  | 3.9 | 0.0 |  |
Sales and Settlements |  |  |  | 0.0 | (35.8) |  |
Principal Reductions |  |  |  | 0.0 | (0.3) |  |
Net transfers to (out of) Level 3 |  |  |  | $ 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 of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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=65884687&loc=d3e4428-111522 + Details
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- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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