Business Segment Information (Schedule of Identifiable Assets By Segment Information) (Details) - USD ($) $ in Millions	Apr. 30, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Total Identifiable assets	$ 6,414.4	$ 4,858.7
CooperVision
Segment Reporting Information [Line Items]
Total Identifiable assets	3,812.4	3,562.6
CooperSurgical
Segment Reporting Information [Line Items]
Total Identifiable assets	2,334.6	1,107.5
Corporate
Segment Reporting Information [Line Items]
Total Identifiable assets	$ 267.4	$ 188.6