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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, 2016 | Sep. 30, 2015
--- | --- | ---
Derivative Asset, Fair Value, Gross Asset | $ 6,584.7 | $ 6,135.6
Derivative Liability, Fair Value, Gross Liability | 6,313.2 | 6,010.1
TBA securities purchased [Member] |  |
Derivative Asset, Fair Value, Gross Asset | 1.7 | 0.6
Derivative Liability, Notional Amount | (199.7) | (163.7)
Derivative Liability, Fair Value, Gross Liability | (0.2) | (0.2)
Derivative Asset, Notional Amount | (539.7) | (194.6)
TBA securities sold [Member] |  |
Derivative Asset, Fair Value, Gross Asset | 0.2 | 0.4
Derivative Liability, Notional Amount | (1,184.8) | (563.8)
Derivative Liability, Fair Value, Gross Liability | (4.0) | (2.0)
Derivative Asset, Notional Amount | (279.4) | (314.1)
Forward settling securities purchased [Member] |  |
Derivative Asset, Fair Value, Gross Asset | 1.5 | 0.1
Derivative Asset, Notional Amount | (481.6) | (163.4)
Over the Counter (OTC) Commodity Contracts [Member] |  |
Derivative Liability, Notional Amount | (595.2) | (286.3)
Derivative Liability, Fair Value, Gross Liability | $ (1.2) | $ (0.4)

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + 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) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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