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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - TBAs and Forward Settling Securities (Details) - USD ($) $ in Millions	Jun. 30, 2017	Sep. 30, 2016
Derivative Asset, Fair Value, Gross Asset	$ 4,285.1	$ 3,715.9
Derivative Liability, Fair Value, Gross Liability	4,494.1	3,580.5
TBA securities purchased [Member]
Derivative Asset, Fair Value, Gross Asset	0.0	0.8
Derivative Liability, Notional Amount	820.6	485.5
Derivative Liability, Fair Value, Gross Liability	(2.7)	(0.8)
Derivative Asset, Notional Amount	(16.0)	(289.8)
TBA securities sold [Member]
Derivative Asset, Fair Value, Gross Asset	6.0	1.3
Derivative Liability, Notional Amount	19.4	754.3
Derivative Liability, Fair Value, Gross Liability	0.0	(1.7)
Derivative Asset, Notional Amount	(1,549.1)	(702.3)
Forward settling securities purchased [Member]
Derivative Asset, Fair Value, Gross Asset	0.5	0.1
Derivative Asset, Notional Amount	(310.9)	(607.9)
Over the Counter (OTC) Commodity Contracts [Member]
Derivative Liability, Notional Amount	365.3	470.4
Derivative Liability, Fair Value, Gross Liability	$ (0.7)	$ 0.2

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
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Nominal or face amount used to calculate payments on the derivative liability.

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