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Business Segment Information - Schedule of Net Sales by Product Lines and Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Jun. 30, 2021	Jun. 30, 2020		Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues		$ 2,208.8	$ 1,580.8		$ 5,674.3	$ 5,072.6
Access Equipment
Segment Reporting Information [Line Items]
Revenues		923.1	479.9		2,222.1	1,890.8
Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues		450.9	221.0		1,087.1	800.7
Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues		233.5	127.5		531.6	546.5
Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues		238.7	131.4		603.4	543.6
Defense
Segment Reporting Information [Line Items]
Revenues	[1]	709.9	558.1		1,874.2	1,684.1
Fire & Emergency
Segment Reporting Information [Line Items]
Revenues	[1]	298.4	297.6		876.9	792.2
Commercial
Segment Reporting Information [Line Items]
Revenues		277.4	245.1		700.4	704.0
Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues		113.4	121.5		278.4	286.9
Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues		137.4	99.2		344.1	330.3
Commercial | Other
Segment Reporting Information [Line Items]
Revenues		26.6	24.4		77.9	86.8
Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]		0.1		0.7	1.5
Operating Segments | Access Equipment
Segment Reporting Information [Line Items]
Revenues		924.3	488.0		2,226.2	1,898.9
Operating Segments | Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues		450.9	221.0		1,087.1	800.7
Operating Segments | Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues		233.5	127.5		531.6	546.5
Operating Segments | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues		239.9	139.5		607.5	551.7
Operating Segments | Defense
Segment Reporting Information [Line Items]
Revenues	[1]	710.4	561.2		1,875.4	1,692.6
Operating Segments | Fire & Emergency
Segment Reporting Information [Line Items]
Revenues	[1]	302.5	299.6		888.9	798.8
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Revenues		278.1	247.7		703.8	708.6
Operating Segments | Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues		113.4	121.5		278.4	286.9
Operating Segments | Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues		137.4	99.2		344.1	330.3
Operating Segments | Commercial | Other
Segment Reporting Information [Line Items]
Revenues		27.3	27.0		81.3	91.4
Corporate, Non-segment | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]	(6.5)	(15.7)		(20.0)	(26.3)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues		(6.5)	(15.7)	[1]	(20.0)	(26.3)	[1]
Intersegment Eliminations | Access Equipment
Segment Reporting Information [Line Items]
Revenues		1.2	8.1		4.1	8.1
Intersegment Eliminations | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues		1.2	8.1		4.1	8.1
Intersegment Eliminations | Defense
Segment Reporting Information [Line Items]
Revenues	[1]	0.5	3.1		1.2	8.5
Intersegment Eliminations | Fire & Emergency
Segment Reporting Information [Line Items]
Revenues	[1]	4.1	2.0		12.0	6.6
Intersegment Eliminations | Commercial
Segment Reporting Information [Line Items]
Revenues		0.7	2.6		3.4	4.6
Intersegment Eliminations | Commercial | Other
Segment Reporting Information [Line Items]
Revenues		0.7	2.6		3.4	4.6
Intersegment Eliminations | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	[1]	$ (6.5)	$ (15.8)		$ (20.7)	$ (27.8)
[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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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.

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