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Contingencies - Narrative (Details) - USD ($)
$ in Millions
Jun. 09, 2015
Sep. 30, 2020
Loss Contingencies [Line Items]    
Loss Contingency, Receivable   $ 5.8
Accrued Liabilities [Member]    
Loss Contingencies [Line Items]    
Loss Contingency Accrual   10.2
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
Environmental and Workplace Matters [Member]    
Loss Contingencies [Line Items]    
Loss Contingency Accrual   1.1
Minimum    
Loss Contingencies [Line Items]    
Loss Contingency, Estimate of Possible Loss   7.9
Maximum    
Loss Contingencies [Line Items]    
Loss Contingency, Estimate of Possible Loss   $ 16.8