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Commitments and Contingencies - Legal Claims and Insurance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Rollforward of reserves for legal claims |  |  |  |
Reserves for legal claims, beginning of period |  |  | $ 434.7 | $ 408.1
Increase in reserves |  |  | 57.1 | 45.5
Payments |  |  | (30.5) | (12.7)
Reserves for legal claims, end of period | $ 461.3 | $ 440.9 | 461.3 | 440.9
Forestar Group [Member] |  |  |  |
Rollforward of reserves for legal claims |  |  |  |
Increase (Decrease) in Prepaid Expenses, Other | $ 12.9 | $ 4.7 | $ 26.2 | $ 8.4

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