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Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020
Goodwill [Line Items]
Gross	$ 2,188.2	$ 2,119.5
Accumulated Impairment	(1,101.7)	(1,110.0)
Net	1,086.5	1,009.5
Access Equipment
Goodwill [Line Items]
Gross	1,816.2	1,814.7
Accumulated Impairment	(932.1)	(932.1)
Net	884.1	882.6
Defense
Goodwill [Line Items]
Gross	75.4
Net	75.4
Fire & Emergency
Goodwill [Line Items]
Gross	108.1	108.1
Accumulated Impairment	(2.0)	(2.0)
Net	106.1	106.1
Commercial
Goodwill [Line Items]
Gross	188.5	196.7
Accumulated Impairment	(167.6)	(175.9)
Net	$ 20.9	$ 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))
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- Definition

Amount before 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 350
-SubTopic 20
-Section 50
-Paragraph 1
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+ References

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