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Commitments and Contingencies - Legal Claims and Insurance (Details) - Homebuilding [Member] - USD ($) $ in Millions | 6 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Rollforward of reserves for legal claims |  |
Reserves for legal claims, beginning of period | $ 423.5 | $ 451.0
Increase in reserves | 56.2 | 0.5
Payments | (38.2) | (25.3)
Reserves for legal claims, end of period | $ 441.5 | $ 426.2

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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 increase (decrease) in 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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