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Contingencies - Narrative (Details) - USD ($) | Jun. 09, 2015 | Sep. 30, 2019
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Loss Contingencies [Line Items] |  |
Loss Contingency, Receivable |  | $ 24,000,000.0
Accrued liabilities |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual |  | 33,800,000
Highway Products Litigation | False Claims Act, USA |  |
Loss Contingencies [Line Items] |  |
Damages awarded by jury verdict | $ 175,000,000.0 |
Total amount of judgment entered by the District Court | 682,400,000 |
Damages awarded by jury verdict, automatically trebled under the Act | 525,000,000.0 |
Civil penalties included in judgment entered by the District Court | 138,400,000 |
Costs and attorney's fees included in judgment entered by the District Court | $ 19,000,000.0 |
Highway Products Litigation | State, county, and municipal actions |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual |  | 0
Class Action, Shareholder | Class Action, Shareholder |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual |  | 7,500,000
Loss Contingency Accrual, Net of Insurance Receivable |  | 2,500,000
Environmental and workplace matters |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual |  | 1,400,000
Minimum |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | 29,600,000
Maximum |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss |  | $ 46,200,000

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