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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

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