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Business Segment Information - Schedule of Net Sales by Product Lines and Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 1,791.7	$ 9,657.9	$ 8,282.0	$ 7,737.3
Access
Segment Reporting Information [Line Items]
Revenues	833.3	4,990.0	3,971.9	3,067.3
Access | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues	415.3	2,461.6	1,949.0	1,471.4
Access | Telehandlers
Segment Reporting Information [Line Items]
Revenues	210.6	1,480.2	1,174.8	769.4
Access | Other
Segment Reporting Information [Line Items]
Revenues	207.4	1,048.2	848.1	826.5
Defense
Segment Reporting Information [Line Items]
Revenues	531.1	2,092.0	2,139.9	2,524.1
Vocational
Segment Reporting Information [Line Items]
Revenues	427.2	2,575.9	2,170.0	2,145.2
Vocational | Fire Apparatus
Segment Reporting Information [Line Items]
Revenues	215.1	1,186.6	1,086.0	1,199.2
Vocational | Refuse Collection
Segment Reporting Information [Line Items]
Revenues	98.2	590.7	536.4	465.9
Vocational | Other
Segment Reporting Information [Line Items]
Revenues	113.9	798.6	547.6	480.1
Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0.1		0.2	0.7
Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,791.7	9,657.9	8,282.0	7,737.3
Operating Segments | Access
Segment Reporting Information [Line Items]
Revenues	833.5	4,990.0	3,972.1	3,072.1
Operating Segments | Access | Aerial Work Platforms
Segment Reporting Information [Line Items]
Revenues	415.3	2,461.6	1,949.0	1,471.4
Operating Segments | Access | Telehandlers
Segment Reporting Information [Line Items]
Revenues	210.6	1,480.2	1,174.8	769.4
Operating Segments | Access | Other
Segment Reporting Information [Line Items]
Revenues	207.6	1,048.2	848.3	831.3
Operating Segments | Access Equipment
Segment Reporting Information [Line Items]
Revenues	833.5	4,990.0	3,972.1	3,072.1
Operating Segments | Defense
Segment Reporting Information [Line Items]
Revenues	531.5	2,098.2	2,141.3	2,525.6
Operating Segments | Vocational
Segment Reporting Information [Line Items]
Revenues	429.2	2,578.1	2,175.7	2,164.2
Operating Segments | Vocational | Fire Apparatus
Segment Reporting Information [Line Items]
Revenues	215.1	1,186.6	1,086.0	1,199.2
Operating Segments | Vocational | Refuse Collection
Segment Reporting Information [Line Items]
Revenues	98.2	590.7	536.4	465.9
Operating Segments | Vocational | Other
Segment Reporting Information [Line Items]
Revenues	115.9	800.8	553.3	499.1
Operating Segments | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(2.5)	(8.4)	(7.1)	(24.6)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(2.5)	(8.4)	(7.1)	(24.6)
Intersegment Eliminations | Access
Segment Reporting Information [Line Items]
Revenues	0.2		0.2	4.8
Intersegment Eliminations | Access | Other
Segment Reporting Information [Line Items]
Revenues	0.2		0.2	4.8
Intersegment Eliminations | Defense
Segment Reporting Information [Line Items]
Revenues	0.4	6.2	1.4	1.5
Intersegment Eliminations | Vocational
Segment Reporting Information [Line Items]
Revenues	2.0	2.2	5.7	19.0
Intersegment Eliminations | Vocational | Other
Segment Reporting Information [Line Items]
Revenues	2.0	2.2	5.7	19.0
Intersegment Eliminations | Corporate and Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	$ (2.6)	$ (8.4)	$ (7.3)	$ (25.3)

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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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