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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, 2021 | Oct. 31, 2020 | Oct. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance Beginning of Year | $ 45.3 | $ 41.5 | $ 39.1
Additions | 8.8 | 5.9 | 3.9
Reductions/ Charges | (2.3) | (2.1) | (1.5)
Balance at End of Year | $ 51.8 | $ 45.3 | $ 41.5

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