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Acquisitions (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 01, 2017 | Apr. 30, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Goodwill (Note 5) |  | $ 2,438.5 | $ 2,392.1 | $ 2,354.8
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | 27.2 | 1,189.6 |
Net tangible assets |  | 1.3 | 59.6 |
Total purchase consideration |  | 64.3 | 1,319.8 |
Goodwill (Note 5) |  | 35.8 | 70.6 |
Paragard |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Property, plant and equipment | $ 2.0 |  |  |
Inventory | 47.3 |  |  |
Other assets | 9.4 |  |  |
Total assets acquired | 1,121.8 |  |  |
Less: liabilities assumed | 16.4 |  |  |
Net tangible assets | 1,105.4 |  |  |
Total purchase consideration | 1,100.0 |  |  |
Inventory step up | 45.4 |  |  |
Technology | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | 10.0 | 0.0 |
Customer relationships | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | 7.5 | 23.5 |
Trademarks | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | 9.7 | 100.0 |
Composite intangible asset | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | 0.0 | 1,061.9 |
Composite intangible asset | Paragard |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles | $ 1,061.9 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 15 years |  |  |
Other | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | $ 0.0 | $ 4.2 |
Assembled Workforce | Paragard |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles | $ 1.2 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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