Business Segment Information - Schedule of Segment Information (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
Operating income (loss)									546.7	403.1	429.1
Interest expense									68.0	82.7	33.4
Other expense (income), net									1.3	(11.5)	1.7
Income before income taxes									477.4	331.9	394.0
Identifiable assets	6,274.5				6,112.8				6,274.5	6,112.8	4,858.7
Depreciation expense									135.0	128.4	120.0
Amortization expense									145.8	146.7	68.4
Capital expenditures									292.1	193.6	127.2
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
Corporate
Segment Reporting Information [Line Items]
Net sales									0.0	0.0	0.0
Operating income (loss)									(47.6)	(56.8)	(47.8)
Identifiable assets	173.1				165.1				173.1	165.1	188.6
Depreciation expense									0.2	0.2	0.3
Amortization expense									0.0	0.0	0.0
Capital expenditures									0.0	0.1	0.1
Operating Segments | CooperVision
Segment Reporting Information [Line Items]
Net sales									1,972.9	1,882.0	1,674.1
Operating income (loss)									506.4	479.8	418.4
Identifiable assets	3,911.6				3,746.0				3,911.6	3,746.0	3,562.6
Depreciation expense									125.8	120.1	115.0
Amortization expense									40.9	43.6	36.7
Capital expenditures									259.0	178.4	108.2
Operating Segments | CooperSurgical
Segment Reporting Information [Line Items]
Net sales									680.5	650.8	464.9
Operating income (loss)									87.9	(19.9)	58.5
Identifiable assets	$ 2,189.8				$ 2,201.7				2,189.8	2,201.7	1,107.5
Depreciation expense									9.0	8.1	4.7
Amortization expense									104.9	103.1	31.7
Capital expenditures									$ 33.1	$ 15.1	$ 18.9