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Investment in Unconsolidated Entities - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties | $ 0.0 | $ 0.0 | $ 14.5 | $ 0.0 |
Investment in unconsolidated entities | 32.2 |  | 32.2 |  | $ 0.0
Outstanding debt, unconsolidated entities | 45.6 |  | 45.6 |  |
Equity in earnings of unconsolidated entities | 0.4 | $ 0.0 | 3.1 | $ 0.0 |
Nonrecourse Debt [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Outstanding debt, unconsolidated entities | 41.1 |  | 41.1 |  |
Segment Reconciling Items [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties | (1.3) |  | (2.9) |  |
Investment in unconsolidated entities | 14.2 |  | 14.2 |  |
Equity in earnings of unconsolidated entities | (0.6) |  | (7.0) |  |
Forestar Group [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties | $ 1.3 |  | $ 4.0 |  |
Number of Equity Method Investments | 6 |  | 6 |  |
Investment in unconsolidated entities | $ 18.0 |  | $ 18.0 |  |
Equity in earnings of unconsolidated entities | $ 1.0 |  | 10.1 |  |
Multifamily [Member] | Forestar Group [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  | $ 19.0 |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: 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(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: 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=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: 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)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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