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Goodwill and Purchased Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Changes in goodwill
Net goodwill at the beginning of the period	$ 1,009.5	$ 995.7
Foreign currency translation	(1.9)	13.8
Acquisition	44.4
Net goodwill at the end of the period	1,052.0	1,009.5
Access Equipment
Changes in goodwill
Net goodwill at the beginning of the period	882.6	868.8
Foreign currency translation	(2.0)	13.8
Net goodwill at the end of the period	880.6	882.6
Defense
Changes in goodwill
Acquisition	44.4
Net goodwill at the end of the period	44.4
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	20.8
Foreign currency translation	0.1
Net goodwill at the end of the period	$ 20.9	$ 20.8

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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.

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