Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Segment Reporting Information [Line Items]
Total net sales	$ 578.2	$ 679.4	$ 1,749.3	$ 1,961.8
Total operating income	72.0	142.2	211.7	400.1
Interest expense	5.7	16.7	30.1	53.3
Other (income) expense, net	(0.1)	(1.5)	8.8	(2.1)
Income before income taxes	66.4	127.0	172.8	348.9
Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Total net sales	449.3	509.1	1,336.7	1,463.3
Total operating income	93.7	134.2	284.4	375.9
Operating Segments | CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	128.9	170.3	412.6	498.5
Total operating income	(9.3)	20.6	(33.3)	59.0
Corporate
Segment Reporting Information [Line Items]
Total operating income	(12.4)	(12.6)	(39.4)	(34.8)
Toric lens | Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Total net sales	147.6	163.1	436.3	464.4
Multifocal lens | Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Total net sales	46.9	52.4	143.8	151.1
Single-use sphere lens | Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Total net sales	126.5	146.3	380.7	413.6
Non single-use sphere, other | Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Total net sales	128.3	147.3	375.9	434.2
Office and surgical products | Operating Segments | CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	81.7	106.3	249.7	307.7
Fertility | Operating Segments | CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	$ 47.2	$ 64.0	$ 162.9	$ 190.8