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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Income (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Oct. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 3,628.6 |
Gross change in value | (70.0) | $ (24.4)
Tax effect for the period | 4.3 | 8.0
Ending balance | 3,627.5 | 3,307.8
Foreign Currency Translation Adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (403.2) |
Gross change in value | (52.2) | 9.0
Tax effect for the period | 0.0 | 0.0
Ending balance | (455.4) | (412.2)
Minimum Pension Liability |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (43.9) |
Gross change in value | 0.0 | (33.4)
Tax effect for the period | 0.0 | 8.0
Ending balance | (43.9) | (18.5)
Derivative Instruments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.0 |
Gross change in value | (17.8) | 0.0
Tax effect for the period |  | 0.0
Ending balance | (13.5) | 0.0
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (447.1) |
Ending balance | $ (512.8) | $ (430.7)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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