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Business Segment Information - Schedule of Net Sales by Product Lines and Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 1,796.7	$ 1,990.2	$ 3,491.8	$ 3,793.6
Access Equipment
Segment Reporting Information [Line Items]
Revenues	693.0	987.6	1,410.9	1,814.1
Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues	273.7	463.5	579.7	801.2
Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues	217.6	319.5	419.0	589.0
Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues	201.7	204.6	412.2	423.9
Defense
Segment Reporting Information [Line Items]
Revenues	614.6	486.2	1,107.2	950.0
Fire and Emergency
Segment Reporting Information [Line Items]
Revenues	253.4	279.0	513.4	570.2
Commercial
Segment Reporting Information [Line Items]
Revenues	235.0	237.1	458.9	458.7
Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues	89.7	115.3	165.4	197.0
Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues	115.2	92.0	231.1	201.2
Commercial | Other
Segment Reporting Information [Line Items]
Revenues	30.1	29.8	62.4	60.5
Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0.7	0.3	1.4	0.6
Operating Segments | Access Equipment
Segment Reporting Information [Line Items]
Revenues	693.0	987.6	1,410.9	1,814.1
Operating Segments | Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues	273.7	463.5	579.7	801.2
Operating Segments | Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues	217.6	319.5	419.0	589.0
Operating Segments | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues	201.7	204.6	412.2	423.9
Operating Segments | Defense
Segment Reporting Information [Line Items]
Revenues	615.0	486.7	1,108.1	950.8
Operating Segments | Fire and Emergency
Segment Reporting Information [Line Items]
Revenues	255.6	283.2	518.0	578.7
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Revenues	236.7	237.9	460.9	460.1
Operating Segments | Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues	89.7	115.3	165.4	197.0
Operating Segments | Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues	115.2	92.0	231.1	201.2
Operating Segments | Commercial | Other
Segment Reporting Information [Line Items]
Revenues	31.8	30.6	64.4	61.9
Corporate, Non-segment | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(3.6)	(5.2)	(6.1)	(10.1)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(3.6)	(5.2)	(6.1)	(10.1)
Intersegment Eliminations | Defense
Segment Reporting Information [Line Items]
Revenues	0.4	0.5	0.9	0.8
Intersegment Eliminations | Fire and Emergency
Segment Reporting Information [Line Items]
Revenues	2.2	4.2	4.6	8.5
Intersegment Eliminations | Commercial
Segment Reporting Information [Line Items]
Revenues	1.7	0.8	2.0	1.4
Intersegment Eliminations | Commercial | Other
Segment Reporting Information [Line Items]
Revenues	1.7	0.8	2.0	1.4
Intersegment Eliminations | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (4.3)	$ (5.5)	$ (7.5)	$ (10.7)

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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