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Schedule II - Valuation and Qualifying Accounts for Deferred Income Tax Valuation Allowance (Details) - SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance Beginning of Year | $ 39.1 | $ 59.1 | $ 13.3
Additions | 3.9 | 2.8 | 45.9
Reductions/ Charges | (1.5) | (22.8) | (0.1)
Balance at End of Year | $ 41.5 | $ 39.1 | $ 59.1

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