Business Segment Information - Schedule of Income (Loss) from Continuing Operations by Reportable Segment (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2025		Jun. 30, 2024		Jun. 30, 2025		Jun. 30, 2024
Segment Reporting Information [Line Items]
Net sales		$ 2,732.1		$ 2,846.9		$ 5,044.9		$ 5,390.7
Cost of sales (excluding R&D)		2,162.6		2,256.7		4,026.7		4,291.2
Research and development		45.0		44.1		93.8		83.4
Gross income		524.5		546.1		924.4		1,016.1
Employee compensation		130.7		131.1		253.2		249.3
Amortization of purchased intangibles		13.8		13.6		27.3		27.1
Intangible asset impairment		5.7		51.6		5.7		51.6
Other segment items		82.6	[1]	88.9	[2]	171.1	[3]	167.5	[4]
Operating income		291.7		260.9		467.1		520.6
Interest expense, net of interest income		(28.1)		(30.3)		(53.1)		(51.1)
Miscellaneous, net		7.3		(1.5)		7.8		(3.5)
Income before income taxes and losses of unconsolidated affiliates		270.9		229.1		421.8		466.0
Operating Segments
Segment Reporting Information [Line Items]
Net sales		2,732.1		2,846.9		5,044.9		5,390.7
Operating Segments | Access Segment
Segment Reporting Information [Line Items]
Net sales		1,256.0		1,406.9		2,213.1		2,644.4
Cost of sales (excluding R&D)		972.2		1,059.4		1,721.9		2,000.9
Research and development		22.0		21.5		43.3		38.9
Gross income		261.8		326.0		447.9		604.6
Employee compensation		40.7		41.7		81.7		79.7
Amortization of purchased intangibles		3.6		2.3		7.0		4.6
Intangible asset impairment		0.0		0.0		0.0		0.0
Other segment items		35.9	[1]	35.5	[2]	74.5	[3]	65.7	[4]
Operating income		181.6		246.5		284.7		454.6
Operating Segments | Vocational Segment
Segment Reporting Information [Line Items]
Net sales		969.7		843.1		1,836.5		1,615.5
Cost of sales (excluding R&D)		735.5		649.8		1,391.1		1,260.9
Research and development		13.8		10.9		32.0		21.7
Gross income		220.4		182.4		413.4		332.9
Employee compensation		35.0		32.0		69.3		63.9
Amortization of purchased intangibles		9.4		9.9		18.8		19.8
Intangible asset impairment		0.0		0.0		0.0		0.0
Other segment items		28.7	[1]	34.0	[2]	60.2	[3]	62.6	[4]
Operating income		147.3		106.5		265.1		186.6
Operating Segments | Transport Segment
Segment Reporting Information [Line Items]
Net sales		479.1		571.9	[5]	942.1		1,081.0	[5]
Cost of sales (excluding R&D)		434.0		528.1	[6]	868.8		988.3	[7]
Research and development		1.2		6.0	[6]	3.7		13.3	[7]
Gross income		43.9		37.8	[6]	69.6		79.4	[7]
Employee compensation		14.0		13.5	[6]	26.9		27.9	[7]
Amortization of purchased intangibles		0.0		0.0	[6]	0.0		0.0	[7]
Intangible asset impairment		0.0		0.0	[6]	0.0		0.0	[7]
Other segment items		12.1	[1]	12.4	[2],[6]	24.3	[3]	26.3	[4],[7]
Operating income		17.8		11.9		18.4		25.2
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Net sales	[8]	27.3		25.0	[5]	53.2		49.8	[5]
Cost of sales (excluding R&D)		20.9		19.4	[6]	44.9		41.1	[7]
Research and development		8.0		5.7	[6]	14.8		9.5	[7]
Gross income		(1.6)		(0.1)	[6]	(6.5)		(0.8)	[7]
Employee compensation		41.0		43.9	[6]	75.3		77.8	[7]
Amortization of purchased intangibles		0.8		1.4	[6]	1.5		2.7	[7]
Intangible asset impairment		5.7		51.6	[6]	5.7		51.6	[7]
Other segment items		5.9	[1]	7.0	[2],[6]	12.1	[3]	12.9	[4],[7]
Operating income		$ (55.0)		$ (104.0)		$ (101.1)		$ (145.8)

[1] Includes outside services and consulting, software and information technology, travel, office expenses, depreciation, advertising, lease expense and other miscellaneous SG&A expenses.

[2] Includes outside services and consulting, software and information technology, travel, office expenses, depreciation, advertising, lease expense and other miscellaneous SG&A expenses.

[3] Includes outside services and consulting, software and information technology, travel, office expenses, depreciation, advertising, lease expense and other miscellaneous SG&A expenses.

[4] Includes outside services and consulting, software and information technology, travel, office expenses, depreciation, advertising, lease expense and other miscellaneous SG&A expenses.

[5] Results have been reclassified to reflect the move of Pratt Miller from the Transport segment to Corporate and Other.

[6] Results have been reclassified to reflect the move of Pratt Miller from the Transport segment to Corporate and Other.

[7] Results have been reclassified to reflect the move of Pratt Miller from the Transport segment to Corporate and Other.

[8] Results for 2024 have been reclassified to reflect the move of Pratt Miller from the Transport segment to Corporate and Other.