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Restructuring and Related Costs - Restructuring and Related Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  | $ 8.4 |  |
Costs recognized |  | $ 5.3 | $ 5.8 | 19.6 | [1] | $ 10.8
Payments |  |  |  | (14.9) |  |
Non-cash charges |  |  |  | (1.1) |  |
Balance, end of period |  | 11.9 |  | 11.9 |  |
Employee Severance |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  | 2.7 |  |
Costs recognized | [1] |  |  | 9.3 |  |
Payments |  |  |  | (6.5) |  |
Non-cash charges |  |  |  | 0.0 |  |
Balance, end of period |  | 5.5 |  | 5.5 |  |
External Support Fees |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  | 2.5 |  |
Costs recognized | [1] |  |  | 4.0 |  |
Payments |  |  |  | (6.5) |  |
Non-cash charges |  |  |  | 0.0 |  |
Balance, end of period |  | 0.0 |  | 0.0 |  |
Lease Exit |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  | 2.8 |  |
Costs recognized | [1] |  |  | 2.5 |  |
Payments |  |  |  | (0.3) |  |
Non-cash charges |  |  |  | (1.1) |  |
Balance, end of period |  | 3.9 |  | 3.9 |  |
Other Project Fees |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Balance, beginning of period |  |  |  | 0.4 |  |
Costs recognized | [1] |  |  | 3.8 |  |
Payments |  |  |  | (1.6) |  |
Non-cash charges |  |  |  | 0.0 |  |
Balance, end of period |  | $ 2.5 |  | $ 2.5 |  |
[1] | We include these costs within corporate expenses.

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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