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Mortgage Loans - Other Mortgage Loans (Details) - Financial Services [Member] - USD ($) $ in Millions	Mar. 31, 2016	Sep. 30, 2015
Loans and Leases Receivable, Allowance [Abstract]
Other mortgage loans	$ 47.7	$ 49.0
Real estate owned	0.3	0.6
Total other mortgage loans and real estate owned, before loss reserves	48.0	49.6
Schedule of mortgage loss reserves
Loan loss reserves	12.4	11.4
Mortgage Loans on Real Estate [Member]
Schedule of mortgage loss reserves
Loan loss reserves	3.5	1.5
Real Estate [Member]
Schedule of mortgage loss reserves
Loan loss reserves	0.1	0.1
Obligation to Repurchase Receivables Sold [Member]
Schedule of mortgage loss reserves
Loan loss reserves	$ 8.8	$ 9.8

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- Definition

Reserve for mortgage loans on real estate.

+ References

No definition available.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.9-03.7(d))
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
-Subsection 1

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Total carrying amount of mortgage loans as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-04.(c) Schedule IV)
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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

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-Publisher FASB
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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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-Publisher FASB
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