Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Apr. 30, 2018	Oct. 31, 2017
Goodwill [Roll Forward]
Balance, beginning	$ 2,354.8	$ 2,164.7
Net additions during the six months ended April 30, 2018	68.4	123.0
Translation	37.9	67.1
Balance, ending	2,461.1	2,354.8
CooperVision
Goodwill [Roll Forward]
Balance, beginning	1,735.7	1,646.4
Net additions during the six months ended April 30, 2018	36.8	28.6
Translation	34.1	60.7
Balance, ending	1,806.6	1,735.7
CooperSurgical
Goodwill [Roll Forward]
Balance, beginning	619.1	518.3
Net additions during the six months ended April 30, 2018	31.6	94.4
Translation	3.8	6.4
Balance, ending	$ 654.5	$ 619.1