Business Segment Information - Summary of Business Segment Net Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 691.6	$ 679.4	$ 654.3	$ 628.1	$ 651.5	$ 660.0	$ 631.3	$ 590.0	$ 2,653.4	$ 2,532.8	$ 2,139.0
CooperVision
Segment Reporting Information [Line Items]
Net sales									1,972.9	1,882.0	1,674.1
CooperSurgical
Segment Reporting Information [Line Items]
Net sales									680.5	650.8	464.9
Toric lens | CooperVision
Segment Reporting Information [Line Items]
Net sales									620.0	591.4	526.8
Multifocal lens | CooperVision
Segment Reporting Information [Line Items]
Net sales									202.9	196.6	177.2
Single-use sphere lens | CooperVision
Segment Reporting Information [Line Items]
Net sales									568.2	520.1	438.3
Non single-use sphere and other | CooperVision
Segment Reporting Information [Line Items]
Net sales									581.8	573.9	531.8
Office and surgical products | CooperSurgical
Segment Reporting Information [Line Items]
Net sales									422.4	400.4	214.7
Fertility | CooperSurgical
Segment Reporting Information [Line Items]
Net sales									$ 258.1	$ 250.4	$ 250.2