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v3.21.2

Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) Home Market OperatingDivisions Projects Segments State | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) Home Market Projects State | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Home
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on Sale of Properties | $ 0.0 |  | $ 0.0 | $ 14.0 | $ 59.5 |
Total assets | 21,793.5 |  |  | 21,793.5 |  | $ 18,912.3
Rental properties | 722.3 |  |  | 722.3 |  | 0.0
Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  | 0.9 | 59.4 |
Total assets | $ 632.2 |  |  | $ 632.2 |  | 379.4
Forestar Group [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of housing construction markets | Market | 55 |  |  | 55 |  |
Number of housing construction states | State | 22 |  |  | 22 |  |
Gain (Loss) on Sale of Properties |  |  |  | $ 0.0 | 0.1 |
Total assets | $ 2,015.0 |  |  | 2,015.0 |  | 1,739.9
Rental properties | $ 0.0 |  |  | $ 0.0 |  |
HomeBuildingMember |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of housing construction markets | Market | 96 |  |  | 96 |  |
Number of housing construction states | State | 30 |  |  | 30 |  |
Number of home building operating divisions | OperatingDivisions | 55 |  |  |  |  |
Number of homebuilding reporting segments | Segments | 6 |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  | $ 13.1 | $ 0.0 |
Total assets | $ 17,504.1 |  |  | 17,504.1 |  | 15,221.4
MultifamilyMember |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross | 0.0 |  |  | 0.0 |  | 232.1
Multifamily [Member] | Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  | 232.1
Total assets | $ 458.3 |  |  | $ 458.3 |  | 246.2
Multi-Family Units, Total | Home | 4,540 |  |  | 4,540 |  |
Multi-Family Units, Under Active Construction | Home | 3,230 |  |  | 3,230 |  |
Multi-Family Units, Completed | Home | 1,310 |  |  | 1,310 |  |
Rental properties | $ 436.3 |  |  | $ 436.3 |  |
Single Family [Member] | HomeBuildingMember |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Home sales | $ 23.1 | $ 31.8 |  |  |  |
Gain (Loss) on Sale of Properties |  | $ 14.0 |  |  |  |
Property, Plant and Equipment, Gross |  |  |  |  |  | $ 87.2
Single Family Rental Units, Completed Homes | Home | 680 |  |  | 680 |  | 440
Single Family Rental Units, Homes and Lots, Total | Home | 2,340 |  |  | 2,340 |  | 740
Gross Profit | $ 11.4 |  |  |  |  |
Rental properties | $ 303.1 |  |  | $ 303.1 |  |
Asset under Construction [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Projects | Projects | 11 |  |  | 11 |  |
Inventories [Member] | Multifamily [Member] | Other Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Projects | Projects | 4 |  |  | 4 |  |

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