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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Property and Equipment [Line Items]
Property and Equipment, Gross	$ 645.8	$ 551.2
Accumulated depreciation	(244.7)	(226.2)
Property and Equipment, Net	401.1	325.0
Depreciation	$ 58.2	49.4	$ 50.8
2510 Household Furniture [Member]
Property and Equipment [Line Items]
Property and Equipment, Useful Life	2 years
Property and Equipment, Gross	$ 127.8	120.4
Office furniture [Member]
Property and Equipment [Line Items]
Property and Equipment, Gross	$ 107.8	99.7
Office furniture [Member] | Minimum [Member]
Property and Equipment [Line Items]
Property and Equipment, Useful Life	2 years
Office furniture [Member] | Maximum [Member]
Property and Equipment [Line Items]
Property and Equipment, Useful Life	5 years
Building and Building Improvements [Member]
Property and Equipment [Line Items]
Property and Equipment, Gross	$ 292.3	219.0
Building and Building Improvements [Member] | Minimum [Member]
Property and Equipment [Line Items]
Property and Equipment, Useful Life	5 years
Building and Building Improvements [Member] | Maximum [Member]
Property and Equipment [Line Items]
Property and Equipment, Useful Life	30 years
Land [Member]
Property and Equipment [Line Items]
Property and Equipment, Gross	$ 63.8	52.9
Multifamily [Member] | Building and Building Improvements [Member]
Property and Equipment [Line Items]
Property and Equipment, Gross	87.3	15.3
Multifamily [Member] | Construction in Progress [Member]
Property and Equipment [Line Items]
Property and Equipment, Gross	54.1	59.2
Multifamily [Member] | Land [Member]
Property and Equipment [Line Items]
Property and Equipment, Gross	$ 36.7	$ 25.2

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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