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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 1,580.8	$ 2,392.7	$ 5,072.6	$ 6,186.3
Access Equipment
Segment Reporting Information [Line Items]
Revenues	479.9	1,249.1	1,890.8	3,063.2
Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues	221.0	664.2	800.7	1,465.4
Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues	127.5	358.9	546.5	947.9
Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues	131.4	226.0	543.6	649.9
Defense
Segment Reporting Information [Line Items]
Revenues	547.0	510.6	1,654.2	1,460.6
Fire and Emergency
Segment Reporting Information [Line Items]
Revenues	308.7	336.9	822.1	907.1
Commercial
Segment Reporting Information [Line Items]
Revenues	245.1	295.6	704.0	754.3
Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues	121.5	136.4	286.9	333.4
Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues	99.2	125.5	330.3	326.7
Commercial | Other
Segment Reporting Information [Line Items]
Revenues	24.4	33.7	86.8	94.2
Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0.1	0.5	1.5	1.1
Operating Segments | Access Equipment
Segment Reporting Information [Line Items]
Revenues	488.0	1,249.1	1,898.9	3,063.2
Operating Segments | Access Equipment | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues	221.0	664.2	800.7	1,465.4
Operating Segments | Access Equipment | Telehandlers
Segment Reporting Information [Line Items]
Revenues	127.5	358.9	546.5	947.9
Operating Segments | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues	139.5	226.0	551.7	649.9
Operating Segments | Defense
Segment Reporting Information [Line Items]
Revenues	547.5	511.1	1,655.6	1,461.9
Operating Segments | Fire and Emergency
Segment Reporting Information [Line Items]
Revenues	310.7	341.0	828.7	919.7
Operating Segments | Commercial
Segment Reporting Information [Line Items]
Revenues	247.7	296.1	708.6	756.2
Operating Segments | Commercial | Concrete Placement
Segment Reporting Information [Line Items]
Revenues	121.5	136.4	286.9	333.4
Operating Segments | Commercial | Refuse Collection
Segment Reporting Information [Line Items]
Revenues	99.2	125.5	330.3	326.7
Operating Segments | Commercial | Other
Segment Reporting Information [Line Items]
Revenues	27.0	34.2	91.4	96.1
Corporate, Non-segment | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(13.1)	(4.6)	(19.2)	(14.7)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(13.1)	(4.6)	(19.2)	(14.7)
Intersegment Eliminations | Access Equipment
Segment Reporting Information [Line Items]
Revenues	8.1		8.1
Intersegment Eliminations | Access Equipment | Other
Segment Reporting Information [Line Items]
Revenues	8.1		8.1
Intersegment Eliminations | Defense
Segment Reporting Information [Line Items]
Revenues	0.5	0.5	1.4	1.3
Intersegment Eliminations | Fire and Emergency
Segment Reporting Information [Line Items]
Revenues	2.0	4.1	6.6	12.6
Intersegment Eliminations | Commercial
Segment Reporting Information [Line Items]
Revenues	2.6	0.5	4.6	1.9
Intersegment Eliminations | Commercial | Other
Segment Reporting Information [Line Items]
Revenues	2.6	0.5	4.6	1.9
Intersegment Eliminations | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (13.2)	$ (5.1)	$ (20.7)	$ (15.8)

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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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