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Restructuring and Other Charges - Restructuring and Related Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 2.8	$ 14.4
Cost of Sales
Restructuring Reserve [Roll Forward]
Restructuring charges	4.7	3.9
Selling, General and Administrative Expenses
Restructuring Reserve [Roll Forward]
Restructuring charges	(1.9)	10.5
Access Equipment
Restructuring Reserve [Roll Forward]
Restructuring charges	3.1	10.4
Access Equipment | Cost of Sales
Restructuring Reserve [Roll Forward]
Restructuring charges	4.6	2.9
Access Equipment | Selling, General and Administrative Expenses
Restructuring Reserve [Roll Forward]
Restructuring charges	(1.5)	7.5
Commercial
Restructuring Reserve [Roll Forward]
Restructuring charges	0.1	1.5
Commercial | Cost of Sales
Restructuring Reserve [Roll Forward]
Restructuring charges	0.1	0.7
Commercial | Selling, General and Administrative Expenses
Restructuring Reserve [Roll Forward]
Restructuring charges		0.8
Fire & Emergency
Restructuring Reserve [Roll Forward]
Restructuring charges		1.4
Fire & Emergency | Cost of Sales
Restructuring Reserve [Roll Forward]
Restructuring charges		0.3
Fire & Emergency | Selling, General and Administrative Expenses
Restructuring Reserve [Roll Forward]
Restructuring charges		1.1
Corporate
Restructuring Reserve [Roll Forward]
Restructuring charges	(0.4)	1.1
Corporate | Selling, General and Administrative Expenses
Restructuring Reserve [Roll Forward]
Restructuring charges	$ (0.4)	$ 1.1

X

- 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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=115931487&loc=d3e140864-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(1))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

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X

- 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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