Derivative Instruments (Details 2) - Interest rate contracts - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015	Oct. 31, 2015
Fair Value Hedges
Gains (losses) on ineffective portion of interest rate fair value hedge derivatives	$ (0.7)	$ (1.4)	$ (1.2)	$ 1.4
Gain (Loss) on Fair Value Hedges
Gains (losses) on interest rate contracts	(3.4)	(116.1)	68.3	52.1
Net accrued interest income on interest rate contracts	37.6	42.5	75.8	85.5
Gains (losses) on borrowings	2.7	114.7	(69.5)	(50.7)
Accrued interest expense on borrowings	71.2	64.6	135.3	130.2
Fair Value Hedges \| Designated as hedges
Fair Value Hedges
Notional amounts	$ 9,325.2	$ 7,978.8	$ 9,325.2	$ 7,978.8	$ 8,048.6

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Represents the accrual of interest expense during the period related to the hedged borrowings.

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Represents the net accrual of interest income during the period related to the interest rate contracts.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

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- Definition

Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

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-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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