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Acquisitions - Total Purchase Consideration for Business and Asset Acquisitions (Details) - USD ($) $ in Millions | Jan. 31, 2021 | Oct. 31, 2020
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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

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