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Acquisitions and Assets Held for Sale - Total Purchase Consideration for Business and Asset Acquisitions (Details) - USD ($) $ in Millions | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2019
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Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Goodwill | $ 2,574.0 | $ 2,447.3 | $ 2,428.9
Series Of Individually Immaterial Business Acquisitions And Asset Acquisitions |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 208.0 | 20.4 | 30.1
Goodwill | 91.6 | 15.3 | 29.8
Net tangible (liabilities) assets | (10.8) | (0.3) | 7.3
Fair value of contingent consideration | (39.1) | 0.0 | 0.0
Total closing purchase price | 249.7 | 35.4 | 67.2
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 | 178.6 | 0.0 | 12.3
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 | 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 | 7.5 | 11.4 | 7.5
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 | 1.3 | 5.1 | 10.2
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 | $ 0.6 | $ 3.9 | $ 0.1

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