Note 15. Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Millions		24 Months Ended	33 Months Ended
	Jun. 09, 2015	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2021
Loss Contingencies [Line Items]
Loss Contingency, Receivable		$ 0.1	$ 0.1
Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		8.7	8.7
Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		19.6	19.6
Environmental and Workplace Matters [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		0.8	0.8
Natural Disasters and Other Casualty Events
Loss Contingencies [Line Items]
Loss Contingency, Receivable		2.1	2.1
Loss Contingency, Receivable, Proceeds			33.0
Property, Plant and Equipment, Additions			23.7
Former Gain Contingency, Recognized in Current Period		(6.3)	(6.3)
Damage from Fire, Explosion or Other Hazard
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds			8.1
Joshua Harman, False Claims Act [Member] | Highway Products Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Judgment Entered, Value	$ 682.4
State, County, and Municipal Actions [Member] | Highway Products Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		0.0	0.0
Missouri Class Action | Highway Products Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		7.2	7.2
Loss Contingency, Estimate of Possible Loss				$ 23.9
Loss Contingency, Estimate of Possible Loss, Net of Tax				$ 18.3
Loss Contingency Accrual, Payments		18.1
Ohio Train Derailment Litigation | Ohio Train Derailment Litigation
Loss Contingencies [Line Items]
Loss Contingency Accrual		0.0	0.0
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 10.9	$ 10.9