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Goodwill and Purchased Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Changes in goodwill
Net goodwill at the beginning of the period	$ 995.7	$ 1,007.9
Foreign currency translation	13.8	(12.2)
Net goodwill at the end of the period	1,009.5	995.7
Access Equipment
Changes in goodwill
Net goodwill at the beginning of the period	868.8	880.9
Foreign currency translation	13.8	(12.1)
Net goodwill at the end of the period	882.6	868.8
Fire & Emergency
Changes in goodwill
Net goodwill at the beginning of the period	106.1	106.1
Net goodwill at the end of the period	106.1	106.1
Commercial
Changes in goodwill
Net goodwill at the beginning of the period	20.8	20.9
Foreign currency translation		(0.1)
Net goodwill at the end of the period	$ 20.8	$ 20.8

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

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