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Revenue Recognition - Disaggregation of Revenue From Contracts With Customers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Net sales $ 330.2 $ 278.8
U.S.    
Disaggregation of Revenue [Line Items]    
Net sales 264.4 215.5
Canada    
Disaggregation of Revenue [Line Items]    
Net sales 42.3 40.6
Europe/Other    
Disaggregation of Revenue [Line Items]    
Net sales 23.5 22.7
Environmental Solutions    
Disaggregation of Revenue [Line Items]    
Net sales 274.2 228.1
Environmental Solutions | Vehicles and equipment    
Disaggregation of Revenue [Line Items]    
Net sales [1] 217.4 179.0
Environmental Solutions | Parts    
Disaggregation of Revenue [Line Items]    
Net sales 40.8 35.7
Environmental Solutions | Rental income    
Disaggregation of Revenue [Line Items]    
Net sales [2] 9.7 7.5
Environmental Solutions | Other    
Disaggregation of Revenue [Line Items]    
Net sales [3] 6.3 5.9
Safety and Security Systems    
Disaggregation of Revenue [Line Items]    
Net sales 56.0 50.7
Safety and Security Systems | Public safety and security equipment    
Disaggregation of Revenue [Line Items]    
Net sales 36.1 31.3
Safety and Security Systems | Industrial signaling equipment    
Disaggregation of Revenue [Line Items]    
Net sales 14.2 13.4
Safety and Security Systems | Warning systems    
Disaggregation of Revenue [Line Items]    
Net sales $ 5.7 $ 6.0
[1] Includes net sales from the sale of new and used vehicles and equipment, including sales of rental equipment.
[2] Represents income from vehicle and equipment lease arrangements with customers.
[3] Primarily includes revenues from services, such as maintenance and repair work, and the sale of extended warranty contracts.