Acquisitions (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Nov. 01, 2017	Jul. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 2,421.3	$ 2,354.8	$ 2,164.7
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		1,189.6	121.9
Net tangible assets (liabilities)		59.6	(4.8)
Total purchase consideration		1,319.8	240.2
Goodwill		70.6	123.1
Paragard
Business Acquisition [Line Items]
Property, plant and equipment	$ 2.0
Inventory	47.3
Other assets	9.4
Total assets acquired	1,121.8
Less: liabilities assumed	16.4
Net tangible assets (liabilities)	1,105.4
Total purchase consideration	1,100.0
Inventory step up	45.4
Technology | Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		0.0	71.7
Customer relationships | Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		23.5	43.1
Trademarks | Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		100.0	7.1
Composite intangible asset | Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		1,061.9	0.0
Composite intangible asset | Paragard
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 1,061.9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Other | Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles		$ 4.2	$ 0.0
Assembled Workforce | Paragard
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 1.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years