Business Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Net sales (Note 2)	$ 654.3	$ 631.3	$ 1,282.4	$ 1,221.3
Operating income (loss)	146.9	74.7	257.8	164.8
Interest expense	18.5	18.7	36.6	37.1
Other expense (income), net	0.3	2.0	(0.7)	(1.1)
Income before income taxes	128.1	54.0	221.9	128.8
CooperVision
Segment Reporting Information [Line Items]
Net sales (Note 2)	484.2	467.5	954.3	912.3
Operating income (loss)	125.5	123.5	241.7	235.8
CooperSurgical
Segment Reporting Information [Line Items]
Net sales (Note 2)	170.1	163.8	328.1	309.0
Operating income (loss)	31.1	(29.8)	38.3	(39.2)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(9.7)	(19.0)	(22.2)	(31.8)
Toric lens \| CooperVision
Segment Reporting Information [Line Items]
Net sales (Note 2)	155.3	150.8	301.3	288.6
Multifocal lens \| CooperVision
Segment Reporting Information [Line Items]
Net sales (Note 2)	49.7	49.1	98.7	96.1
Single-use sphere lens \| CooperVision
Segment Reporting Information [Line Items]
Net sales (Note 2)	135.3	124.4	267.3	240.7
Non single-use sphere and other \| CooperVision
Segment Reporting Information [Line Items]
Net sales (Note 2)	143.9	143.2	287.0	286.9
Office and surgical procedures \| CooperSurgical
Segment Reporting Information [Line Items]
Net sales (Note 2)	105.7	97.9	201.4	186.0
Fertility \| CooperSurgical
Segment Reporting Information [Line Items]
Net sales (Note 2)	$ 64.4	$ 65.9	$ 126.7	$ 123.0

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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