Allowance for Credit Losses and Credit Quality of Receivables - Write-offs (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Dollars
Total write-offs	$ (91.3)	$ (55.9)	$ (45.7)
Total recoveries	24.9	22.6	20.2
Total net write-offs	$ (66.4)	$ (33.3)	$ (25.5)
Percent
Total write-offs (as a percent)	(0.32%)	(0.19%)	(0.16%)
Total recoveries (as a percent)	0.09%	0.08%	0.07%
Total net write-offs (as a percent)	(0.23%)	(0.11%)	(0.09%)
Retail notes
Dollars
Total write-offs	$ (29.9)	$ (17.8)	$ (12.7)
Total recoveries	$ 5.8	$ 6.5	$ 5.5
Percent
Total write-offs (as a percent)	(0.17%)	(0.10%)	(0.07%)
Total recoveries (as a percent)	0.03%	0.03%	0.03%
Retail notes | Agriculture and turf
Dollars
Total write-offs	$ (10.5)	$ (9.5)	$ (6.1)
Total recoveries	$ 4.3	$ 4.7	$ 3.3
Percent
Total write-offs (as a percent)	(0.07%)	(0.06%)	(0.04%)
Total recoveries (as a percent)	0.03%	0.03%	0.02%
Retail notes | Construction and forestry
Dollars
Total write-offs	$ (19.4)	$ (8.3)	$ (6.6)
Total recoveries	$ 1.5	$ 1.8	$ 2.2
Percent
Total write-offs (as a percent)	(0.79%)	(0.35%)	(0.33%)
Total recoveries (as a percent)	0.06%	0.08%	0.11%
Revolving charge accounts
Dollars
Total write-offs	$ (54.3)	$ (36.2)	$ (24.6)
Total recoveries	$ 18.5	$ 15.3	$ 14.3
Percent
Total write-offs (as a percent)	(2.13%)	(1.58%)	(1.11%)
Total recoveries (as a percent)	0.73%	0.68%	0.65%
Wholesale receivables
Dollars
Total write-offs	$ (4.1)	$ (0.3)	$ (7.7)
Total recoveries	$ 0.1	$ 0.6	$ 0.1
Percent
Total write-offs (as a percent)	(0.05%)		(0.09%)
Total recoveries (as a percent)		0.01%
Financing leases
Dollars
Total write-offs	$ (3.0)	$ (1.6)	$ (0.5)
Total recoveries	$ 0.5	$ 0.2	$ 0.2
Percent
Total write-offs (as a percent)	(0.54%)	(0.29%)	(0.09%)
Total recoveries (as a percent)	0.09%	0.04%	0.04%
Operating loans
Dollars
Total write-offs			$ (0.2)
Total recoveries			$ 0.1
Percent
Total write-offs (as a percent)			(1.45%)
Total recoveries (as a percent)			0.73%