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Acquisitions - Total Purchase Consideration for Business and Asset Acquisitions (Details) - USD ($) $ in Millions | Jul. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
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Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Goodwill | $ 2,391.4 | $ 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 |
Customer relationships |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 7.5 | 23.5 |
Trademarks |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 10.2 | 100.0 |
Composite intangible asset |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 0.0 | 1,061.9 |
Other |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 0.1 | 4.2 |
Acquisitions 2019 |  |  |
Schedule Of Business Acquisitions And Asset Acquisition, By Acquisition [Line Items] |  |  |
Total identifiable intangible assets | 30.1 |  |
Goodwill | 35.8 |  |
Net tangible assets | 1.3 |  |
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 |  | 59.6 |
Total purchase price |  | $ 1,319.8 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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