The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount				$ 1,995.8	$ 2,012.1
Accumulated Amortization & Translation				599.4	499.7
Intangible assets with definitive lives, net				$ 1,396.4	1,512.4
Weighted Average Amortization Period (In years)				14 years
Intangible assets with indefinite lives, net				$ 8.9	8.9
Total other intangible assets, net				1,405.3	1,521.3
Impairment of intangibles			$ 24.4	0.4	24.4	$ 0.0
Gain on sale of an intangible				19.0	0.0	0.0
Amortization of intangibles				145.8	146.7	$ 68.4
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount				148.5	138.1
Accumulated Amortization & Translation				$ 27.3	16.9
Weighted Average Amortization Period (In years)				14 years
Composite intangible asset
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount				$ 1,061.9	1,061.9
Accumulated Amortization & Translation				$ 141.6	70.8
Weighted Average Amortization Period (In years)				15 years
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount				$ 399.9	387.2
Accumulated Amortization & Translation				$ 221.2	190.7
Weighted Average Amortization Period (In years)				11 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount				$ 357.6	350.0
Accumulated Amortization & Translation				$ 194.0	168.6
Weighted Average Amortization Period (In years)				13 years
License and distribution rights and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount				$ 27.9	74.9
Accumulated Amortization & Translation				$ 15.3	$ 52.7
Weighted Average Amortization Period (In years)				11 years
CooperSurgical
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of exclusive distribution right to distribute Filshie Clip System in the U.S.		$ 21.0
Gain on sale of an intangible		$ 19.0
CooperVision \| Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 37.3