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Income Taxes - Reconciliation of Total Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | $ 35.8 | $ 53.4 | $ 57.2
Additions for tax positions related to the current year | 0.0 | 0.2 | 0.0
Additions for tax positions related to prior years | 3.6 | 0.0 | 16.4
Reductions for tax positions related to prior years | 0.0 | (9.0) | (0.1)
Reductions for lapse of statute of limitations | (3.9) | (8.7) | (19.7)
Settlements | (0.3) | (0.1) | (0.3)
Ending Balance | $ 35.3 | $ 35.8 | $ 53.4

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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