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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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Homebuilding revenues expressed as a percentage of consolidated revenues.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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