Note 2. Acquisitions and Discontinued Operations - Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of benefit for income taxes of $4.1, $3.6, and $1.1	$ (3.0)	$ (5.3)	$ (1.7)	$ (4.3)	$ (5.3)	$ (2.7)	$ (2.3)	$ (3.1)	$ (14.3)	$ (13.4)	$ (20.3)
Loss on sale of discontinued operations, net of benefit for income taxes of $—, $—, and $1.4									0.0	0.0	(5.7)
Cash Provided by (Used in) Investing Activities, Discontinued Operations									0.0	0.0	2.7
Amounts reclassified to discontinued operations, net of tax									0.0	0.0	1.3
Sale of Highway Products
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									(18.4)	(17.0)	(21.4)
Loss from discontinued operations, net of benefit for income taxes of $4.1, $3.6, and $1.1									$ (14.3)	$ (13.4)	(20.3)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax											(5.8)
Loss on sale of discontinued operations, net of benefit for income taxes of $—, $—, and $1.4											$ (4.4)