Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jul. 31, 2018	Oct. 31, 2017
Goodwill [Roll Forward]
Balance, beginning	$ 2,354.8	$ 2,164.7
Net additions during the nine months ended July 31, 2018	71.2	123.0
Translation	(4.7)	67.1
Balance, ending	2,421.3	2,354.8
CooperVision
Goodwill [Roll Forward]
Balance, beginning	1,735.7	1,646.4
Net additions during the nine months ended July 31, 2018	36.8	28.6
Translation	(4.3)	60.7
Balance, ending	1,768.2	1,735.7
CooperSurgical
Goodwill [Roll Forward]
Balance, beginning	619.1	518.3
Net additions during the nine months ended July 31, 2018	34.4	94.4
Translation	(0.4)	6.4
Balance, ending	$ 653.1	$ 619.1