Contingencies - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended	12 Months Ended	21 Months Ended	30 Months Ended
	Jun. 09, 2015	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2023
Loss Contingencies [Line Items]
Loss Contingency, Receivable		$ 14.0	$ 14.0		$ 14.0	$ 14.0
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		22.9	22.9		22.9	22.9
Highway Products Litigation | False Claims Act, USA
Loss Contingencies [Line Items]
Loss Contingency, Judgment Entered, Value	$ 682.4
Highway Products Litigation | State, County, and Municipal Actions [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		0.0	0.0		0.0	0.0
Highway Products Litigation | Missouri Class Action
Loss Contingencies [Line Items]
Loss Contingency Accrual		7.7	7.7		7.7	7.7
Loss Contingency, Loss in Period				$ 23.9
Loss Contingency, Loss in Period, Net of Tax				$ 18.3
Loss Contingency Accrual, Payments					17.5
Ohio Train Derailment Litigation | Ohio Train Derailment Litigation
Loss Contingencies [Line Items]
Loss Contingency Accrual		0.0	0.0		0.0	0.0
Environmental and Workplace Matters [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		1.0	1.0		1.0	1.0
Loss from Catastrophes
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds						32.7
Property, Plant and Equipment, Additions						23.4
Gain Contingency Recognized In Current Period		(3.7)	(4.9)
Damage from Fire, Explosion or Other Hazard
Loss Contingencies [Line Items]
Loss Contingency, Receivable, Proceeds						8.1
Minimum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		22.5	22.5		22.5	22.5
Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 33.7	$ 33.7		$ 33.7	$ 33.7