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Acquisitions - Total Purchase Consideration for Business and Asset Acquisitions (Details) - USD ($) | Apr. 30, 2020 | Oct. 31, 2019
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Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Goodwill | $ 2,400,000,000.0 | $ 2,428,900,000
Customer relationships |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Total identifiable intangible assets | 6.5 | 7.5
Technology |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Total identifiable intangible assets | 0 | 12.3
Trademarks |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Total identifiable intangible assets | 0 | 10.2
Other |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Total identifiable intangible assets | 0 | 0.1
Acquisitions 2019 |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Total identifiable intangible assets | 6.5 |
Goodwill | 1.9 |
Net tangible assets | 0.8 |
Total purchase price | $ 9.2 |
Acquisitions 2018 |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |
Total identifiable intangible assets |  | 30.1
Goodwill |  | 29.8
Net tangible assets |  | 7.3
Total purchase price |  | $ 67.2

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