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Acquisitions - Total Purchase Consideration for Business and Asset Acquisitions (Details) - USD ($) $ in Millions | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
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Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Goodwill | $ 2,428.9 | $ 2,392.1 | $ 2,354.8
Technology |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 12.3 | 0.0 | 71.7
Customer relationships |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 7.5 | 23.5 | 43.1
Trademarks |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 10.2 | 100.0 | 7.1
Composite intangible asset |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 0.0 | 1,061.9 | 0.0
Other |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 0.1 | 4.2 | 0.0
Acquisitions 2019 |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 30.1 |  |
Goodwill | 29.8 |  |
Net tangible assets (liabilities) | 7.3 |  |
Total purchase price | $ 67.2 |  |
Acquisitions 2018 |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets |  | 1,189.6 |
Goodwill |  | 70.6 |
Net tangible assets (liabilities) |  | 59.6 |
Total purchase price |  | $ 1,319.8 |
Acquisitions 2017 |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets |  |  | 121.9
Goodwill |  |  | 123.1
Net tangible assets (liabilities) |  |  | (4.8)
Total purchase price |  |  | $ 240.2

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