Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Goodwill [Roll Forward]
Balance, beginning	$ 2,392.1	$ 2,354.8
Net additions during the six months ended April 30, 2019	35.8	71.2
Translation	10.6	(33.9)
Balance, ending	2,438.5	2,392.1
CooperVision
Goodwill [Roll Forward]
Balance, beginning	1,742.9	1,735.7
Net additions during the six months ended April 30, 2019	13.8	36.8
Translation	11.2	(29.6)
Balance, ending	1,767.9	1,742.9
CooperSurgical
Goodwill [Roll Forward]
Balance, beginning	649.2	619.1
Net additions during the six months ended April 30, 2019	22.0	34.4
Translation	(0.6)	(4.3)
Balance, ending	$ 670.6	$ 649.2