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Goodwill and Purchased Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Millions	6 Months Ended
	Mar. 31, 2020 USD ($)
Changes in goodwill
Net goodwill at the beginning of the period	$ 995.7
Foreign currency translation	0.2
Net goodwill at the end of the period	995.9
Access Equipment
Changes in goodwill
Net goodwill at the beginning of the period	868.8
Foreign currency translation	0.3
Net goodwill at the end of the period	869.1
Fire and Emergency
Changes in goodwill
Net goodwill at the beginning of the period	106.1
Net goodwill at the end of the period	106.1
Commercial
Changes in goodwill
Net goodwill at the beginning of the period	20.8
Foreign currency translation	(0.1)
Net goodwill at the end of the period	$ 20.7

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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- Definition

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+ References

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