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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Oct. 31, 2020 | Oct. 31, 2019
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 583,500,000 | $ 606,200,000
Accumulated Amortization | (343,800,000) | (309,000,000.0)
Total | 239,700,000 | 297,200,000
Net impairment charge | $ 9,000,000.0 | $ 0
Intangible assets weighted average life | 11 years | 11 years
Aviation |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Net impairment charge | $ 5,600,000 |
Reduction in carrying amount | (13,800,000) |
Amortization of intangible assets | 8,200,000 |
Technical Solutions |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Net impairment charge | 3,400,000 |
Reduction in carrying amount | (8,700,000) |
Amortization of intangible assets | 5,300,000 |
Customer contracts and relationships |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 573,100,000 | $ 595,900,000
Accumulated Amortization | (333,600,000) | (298,900,000)
Total | 239,600,000 | 297,000,000.0
Trademarks and trade names |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9,800,000 | 9,800,000
Accumulated Amortization | (9,800,000) | (9,800,000)
Total | 0 | 100,000
Contract rights and other |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 500,000 | 500,000
Accumulated Amortization | (400,000) | (400,000)
Total | $ 100,000 | $ 100,000

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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