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Segment Information (Details Textuals) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Market State Segments OperatingDivisions | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) Market State | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross | $ 551.2 |  |  |  | $ 390.9 |  |  |  | $ 551.2 | $ 390.9 |
Assets | 12,184.6 |  |  |  | 11,558.9 |  |  |  | 12,184.6 | 11,558.9 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | $ 485.5 | $ 444.5 | $ 353.9 | $ 318.1 | 433.0 | $ 378.6 | $ 300.5 | $ 241.3 | $ 1,602.1 | $ 1,353.5 | $ 1,123.4
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of homebuilding operating divisions | OperatingDivisions | 41 |  |  |  |  |  |  |  |  |  |
Number of homebuilding reporting segments | Segments | 6 |  |  |  |  |  |  |  |  |  |
Homebuilding percentage of consolidated revenues |  |  |  |  |  |  |  |  | 98.00% | 98.00% | 98.00%
Number of housing construction states | State | 26 |  |  |  |  |  |  |  | 26 |  |
Number of housing construction markets | Market | 79 |  |  |  |  |  |  |  | 79 |  |
Assets | $ 11,377.5 |  |  |  | 10,774.2 |  |  |  | $ 11,377.5 | $ 10,774.2 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 1,489.3 | 1,264.4 | $ 1,018.3
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 143.3 |  |  |  | $ 54.9 |  |  |  | 143.3 | 54.9 |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | (11.7) | $ (9.0) | $ 0.0
Other Segments [Member] | Multifamily [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross | $ 93.7 |  |  |  |  |  |  |  | $ 93.7 |  |

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