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Segment and Geographic Information - Revenues by Geographic Region (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017		Oct. 31, 2016		Oct. 31, 2015
Revenues
Revenues		$ 1,497.9	$ 1,318.4	$ 1,310.5	$ 1,326.7	$ 1,322.3	$ 1,296.9	$ 1,257.1	$ 1,268.4	$ 5,453.6	[1]	$ 5,144.7	[1]	$ 4,897.8	[1]
United States
Revenues
Revenues	[1]									5,126.8		4,845.3		4,687.2
All other countries
Revenues
Revenues	[1]									$ 326.8		$ 299.4		$ 210.6
[1] Substantially all of our long-lived assets are related to United States operations.

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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