Business Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Segment Reporting Information [Line Items]
Total net sales	$ 679.4	$ 660.0	$ 1,961.8	$ 1,881.3
Total operating income	142.2	115.6	400.1	280.4
Interest expense	16.7	22.8	53.3	59.9
Other (income) expense, net	(1.5)	2.4	(2.1)	1.3
Income before income taxes	127.0	90.4	348.9	219.2
CooperVision
Segment Reporting Information [Line Items]
Total net sales	509.1	489.1	1,463.3	1,401.4
CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	170.3	170.9	498.5	479.9
Toric lens | CooperVision
Segment Reporting Information [Line Items]
Total net sales	163.1	153.6	464.4	442.2
Multifocal lens | CooperVision
Segment Reporting Information [Line Items]
Total net sales	52.4	52.7	151.1	148.8
Single-use sphere lens | CooperVision
Segment Reporting Information [Line Items]
Total net sales	146.3	137.6	413.6	378.3
Non single-use sphere and other | CooperVision
Segment Reporting Information [Line Items]
Total net sales	147.3	145.2	434.2	432.1
Office and surgical products | CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	106.3	104.4	307.7	290.4
Fertility | CooperSurgical
Segment Reporting Information [Line Items]
Total net sales	64.0	66.5	190.8	189.5
Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Total operating income	134.2	125.4	375.9	361.1
Operating Segments | CooperSurgical
Segment Reporting Information [Line Items]
Total operating income	20.6	1.6	59.0	(37.5)
Corporate
Segment Reporting Information [Line Items]
Total operating income	$ (12.6)	$ (11.4)	$ (34.8)	$ (43.2)