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Business Segment Information - Schedule of Net Sales by Product Lines and Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues		$ 1,576.5	$ 1,695.1
Access Equipment
Segment Reporting Information [Line Items]
Revenues		562.4	717.9
Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues		278.0	306.0
Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues		122.9	201.4
Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues		161.5	210.5
Defense
Segment Reporting Information [Line Items]
Revenues	[1]	550.0	499.9
Fire & Emergency
Segment Reporting Information [Line Items]
Revenues	[1]	269.8	252.7
Commercial
Segment Reporting Information [Line Items]
Revenues		194.2	223.9
Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues		67.7	75.7
Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues		102.3	115.9
Commercial | Other
Segment Reporting Information [Line Items]
Revenues		24.2	32.3
Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]	0.1	0.7
Operating Segments | Access Equipment
Segment Reporting Information [Line Items]
Revenues		563.7	717.9
Operating Segments | Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues		278.0	306.0
Operating Segments | Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues		122.9	201.4
Operating Segments | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues		162.8	210.5
Operating Segments | Defense
Segment Reporting Information [Line Items]
Revenues	[1]	550.3	500.4
Operating Segments | Fire & Emergency
Segment Reporting Information [Line Items]
Revenues	[1]	273.9	256.9
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Revenues		195.7	224.2
Operating Segments | Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues		67.7	75.7
Operating Segments | Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues		102.3	115.9
Operating Segments | Commercial | Other
Segment Reporting Information [Line Items]
Revenues		25.7	32.6
Corporate, Non-segment | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]	(7.1)	(4.3)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		(7.1)	(4.3)	[1]
Intersegment Eliminations | Access Equipment
Segment Reporting Information [Line Items]
Revenues		1.3
Intersegment Eliminations | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues		1.3
Intersegment Eliminations | Defense
Segment Reporting Information [Line Items]
Revenues	[1]	0.3	0.5
Intersegment Eliminations | Fire & Emergency
Segment Reporting Information [Line Items]
Revenues	[1]	4.1	4.2
Intersegment Eliminations | Commercial
Segment Reporting Information [Line Items]
Revenues		1.5	0.3
Intersegment Eliminations | Commercial | Other
Segment Reporting Information [Line Items]
Revenues		1.5	0.3
Intersegment Eliminations | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]	$ (7.2)	$ (5.0)
[1] Results have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.

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