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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	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Restructuring provision	$ 2.8	$ 14.4
Accelerated depreciation related to restructuring	3.6	6.9
Gain from insurance proceeds		6.2
Corporate, Non-segment
Segment Reporting Information [Line Items]
Restructuring provision		1.1
Restructuring benefit	0.4
Interest Expense
Segment Reporting Information [Line Items]
Gain (loss) on extinguishment of debt		(8.5)
Interest Income
Segment Reporting Information [Line Items]
Interest income from arbitration settlement		3.3
Access Equipment
Segment Reporting Information [Line Items]
Restructuring provision	3.1	10.4
Accelerated depreciation related to restructuring	3.6	2.8
Access Equipment | Operating Expenses
Segment Reporting Information [Line Items]
Restructuring provision	7.4	4.7
Defense
Segment Reporting Information [Line Items]
Transaction costs related to acquisition	1.0
Reimbursement of legal costs associated with arbitration settlement		0.9
Fire & Emergency
Segment Reporting Information [Line Items]
Restructuring provision		1.4
Commercial
Segment Reporting Information [Line Items]
Restructuring provision	$ 0.1	1.5
Accelerated depreciation related to restructuring		4.1
Gain on Business Interruption Insurance Recovery		18.5
Gain (Loss) on Disposition of Business		3.1
Commercial | Operating Income
Segment Reporting Information [Line Items]
Gain on Business Interruption Insurance Recovery		$ 12.3

X

- Definition

Gain (loss) from insurance proceeds.

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Reimbursement of legal costs.

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Restructuring benefit.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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-SubTopic 10
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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

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- Definition

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Interest expense (income) directly attributable to an award in settlement of litigation.

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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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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