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Business Segment Information - Schedule of Income (Loss) from Continuing Operations by Product Lines and Reportable Segments (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring provision | $ 13.0 | $ 10.2 |  | $ 14.4 |
Accelerated depreciation related to restructuring |  |  |  | 6.9 |
Gain (loss) on extinguishment of debt |  |  | $ (8.5) |  |
Gain from insurance proceeds |  |  |  | 6.2 |
Interest Expense |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | (8.5) | $ (9.9)
Interest Income |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Interest income from arbitration settlement |  |  |  | 3.3 |
Access Equipment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring provision |  |  |  | 10.4 | 4.7
Accelerated depreciation related to restructuring |  |  |  | 2.8 |
Access Equipment | Operating Expenses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring provision |  |  |  | 4.7 | 24.8
Defense |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Reimbursement of legal costs associated with arbitration settlement |  |  |  | 0.9 |
Former Gain Contingency, Recognized in Current Period | 4.2 |  |  | 4.2 | 19.0
Fire & Emergency |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring provision |  |  |  | 1.4 |
Commercial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring provision |  |  |  | 1.5 | 5.4
Former Gain Contingency, Recognized in Current Period | 1.5 |  |  | 1.5 |
Accelerated depreciation related to restructuring |  |  |  | 4.1 |
Gain on Business Interruption Insurance Recovery | 18.5 |  |  | 18.5 | 6.6
Gain (Loss) on Disposition of Business | $ 3.1 |  |  | 3.1 | (1.4)
Commercial | Operating Income |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on Business Interruption Insurance Recovery |  |  |  | 12.3 | $ 6.6
Corporate, Non-segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring provision |  |  |  | $ 1.1 |

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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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