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Commitments and Contingencies - Legal Claims and Insurance (Details) - Homebuilding [Member] - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Loss Contingencies [Line Items] |  |  |
Construction Defect Portion of Loss Contingency Accrual | 96.00% |  | 95.00%
Rollforward of reserves for legal claims |  |  |
Reserves for legal claims, beginning of period | $ 423.5 | $ 451.0 |
Increase in reserves | 86.2 | 15.2 |
Payments | (56.2) | (39.8) |
Reserves for legal claims, end of period | $ 453.5 | $ 426.4 |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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