Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Segment Reporting Information [Line Items]
Total net sales	$ 524.9	$ 654.3	$ 1,171.1	$ 1,282.4
Total operating income	28.6	146.9	139.7	257.8
Interest expense	12.8	18.5	24.4	36.6
Other expense (Income), net	6.8	0.3	8.9	(0.7)
Income before income taxes	9.0	128.1	106.4	221.9
CooperVision
Segment Reporting Information [Line Items]
Total net sales	402.2	484.2	887.4	954.3
CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	122.7	170.1	283.7	328.1
Toric lens \| CooperVision
Segment Reporting Information [Line Items]
Total net sales	133.6	155.3	288.7	301.3
Multifocal lens \| CooperVision
Segment Reporting Information [Line Items]
Total net sales	45.1	49.7	96.9	98.7
Single-use sphere lens \| CooperVision
Segment Reporting Information [Line Items]
Total net sales	116.1	135.3	254.2	267.3
Non single-use sphere, other \| CooperVision
Segment Reporting Information [Line Items]
Total net sales	107.4	143.9	247.6	287.0
Office and surgical products \| CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	69.6	105.7	168.0	201.4
Fertility \| CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	53.1	64.4	115.7	126.7
Operating Segments \| CooperVision
Segment Reporting Information [Line Items]
Total operating income	67.7	125.5	190.6	241.7
Operating Segments \| CooperSurgical
Segment Reporting Information [Line Items]
Total operating income	(25.6)	31.1	(23.9)	38.3
Corporate
Segment Reporting Information [Line Items]
Total operating income	$ (13.5)	$ (9.7)	$ (27.0)	$ (22.2)

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

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