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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 124.7 | $ 105.4 | $ 236.0 | $ 189.0 |
Effective tax rate (percent) | 35.20% | 35.10% | 35.10% | 34.90% |
Deferred tax assets net of DTL | $ 461.9 |  | $ 461.9 |  | $ 486.6
Homebuilding [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance for deferred income taxes | $ 10.3 |  | $ 10.3 |  | $ 10.3

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