Receivables - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2015
Allowance:
Beginning of period balance	$ 112.4	$ 111.2	$ 109.8	$ 112.4
Provision (credit) for credit losses	29.8	17.4	57.4	29.5
Write-offs	(35.5)	(25.3)	(72.7)	(48.2)
Recoveries	7.0	6.8	19.2	17.5
Other changes (primarily translation adjustments)	(0.4)	(0.3)	(0.4)	(1.4)
End of period balance	113.3	109.8	113.3	109.8
Balance individually evaluated	4.2	0.8	4.2	0.8
Receivables:
End of period balance	28,873.4	30,372.7	28,873.4	30,372.7	$ 29,092.4
Balance individually evaluated	56.1	23.7	56.1	23.7
Retail notes
Allowance:
Beginning of period balance	55.5	55.7	53.3	56.1
Provision (credit) for credit losses	7.2	3.2	21.5	7.8
Write-offs	(7.2)	(6.4)	(22.3)	(13.8)
Recoveries	1.4	2.1	4.4	5.1
Other changes (primarily translation adjustments)	(0.2)	(0.2)	(0.2)	(0.8)
End of period balance	56.7	54.4	56.7	54.4
Balance individually evaluated	2.9	0.8	2.9	0.8
Receivables:
End of period balance	17,491.6	18,554.9	17,491.6	18,554.9
Balance individually evaluated	39.9	19.5	39.9	19.5
Revolving charge accounts
Allowance:
Beginning of period balance	39.7	39.9	39.7	39.9
Provision (credit) for credit losses	22.0	13.4	34.0	20.9
Write-offs	(27.4)	(18.2)	(48.4)	(33.0)
Recoveries	5.4	4.6	14.4	11.9
End of period balance	39.7	39.7	39.7	39.7
Receivables:
End of period balance	2,937.3	2,618.4	2,937.3	2,618.4	2,680.8
Balance individually evaluated	2.3	3.0	2.3	3.0
Wholesale receivables
Allowance:
Beginning of period balance	8.4	7.2	8.1	7.6
Provision (credit) for credit losses	0.1	0.3	0.2	(0.1)
Write-offs	(0.1)	(0.1)	(0.1)	(0.3)
Recoveries	0.1	0.1	0.1	0.5
Other changes (primarily translation adjustments)	(0.1)	(0.1)	0.1	(0.3)
End of period balance	8.4	7.4	8.4	7.4
Balance individually evaluated	1.3		1.3
Receivables:
End of period balance	7,866.9	8,660.5	7,866.9	8,660.5	7,185.5
Balance individually evaluated	13.0	1.2	13.0	1.2
Financing leases
Allowance:
Beginning of period balance	8.8	8.4	8.7	8.8
Provision (credit) for credit losses	0.5	0.5	1.7	0.9
Write-offs	(0.8)	(0.6)	(1.9)	(1.1)
Recoveries	0.1		0.3
Other changes (primarily translation adjustments)	(0.1)		(0.3)	(0.3)
End of period balance	8.5	8.3	8.5	8.3
Receivables:
End of period balance	577.6	$ 538.9	577.6	$ 538.9	$ 567.1
Balance individually evaluated	$ 0.9		$ 0.9