Acquisitions - Total Purchase Consideration for Business and Asset Acquisitions (Details) - USD ($) $ in Millions	Jan. 31, 2021	Oct. 31, 2020
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Goodwill	$ 2,553.3	$ 2,447.3
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Total identifiable intangible assets	99.5	20.4
Goodwill	49.6	15.3
Net tangible assets	(21.8)	(0.3)
Fair value of contingent consideration	(37.9)	0.0
Total closing purchase price	89.4	35.4
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions | Technology
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Total identifiable intangible assets	72.0	0.0
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions | In-Process Research & Development (IPR&D)
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Total identifiable intangible assets	20.0	0.0
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions | Customer relationships
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Total identifiable intangible assets	6.7	11.4
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions | Trademarks
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Total identifiable intangible assets	0.8	5.1
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions | Other
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items]
Total identifiable intangible assets	$ 0.0	$ 3.9