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Revenue Recognition - Disaggregation of Revenue From Contracts With Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Net sales $ 346.4 $ 298.3 $ 1,043.3 $ 911.8
U.S.        
Disaggregation of Revenue [Line Items]        
Net sales 275.9 233.3 840.1 692.5
Canada        
Disaggregation of Revenue [Line Items]        
Net sales 44.9 44.9 131.2 151.6
Europe/Other        
Disaggregation of Revenue [Line Items]        
Net sales 25.6 20.1 72.0 67.7
Environmental Solutions        
Disaggregation of Revenue [Line Items]        
Net sales 284.8 249.1 865.3 758.5
Environmental Solutions | Vehicles and equipment        
Disaggregation of Revenue [Line Items]        
Net sales [1] 214.8 185.5 668.0 578.2
Environmental Solutions | Parts        
Disaggregation of Revenue [Line Items]        
Net sales 44.1 37.5 130.0 112.7
Environmental Solutions | Rental income        
Disaggregation of Revenue [Line Items]        
Net sales [2] 14.4 11.9 40.2 32.6
Environmental Solutions | Other        
Disaggregation of Revenue [Line Items]        
Net sales [3] 11.5 14.2 27.1 35.0
Safety and Security Systems        
Disaggregation of Revenue [Line Items]        
Net sales 61.6 49.2 178.0 153.3
Safety and Security Systems | Public safety and security equipment        
Disaggregation of Revenue [Line Items]        
Net sales 36.3 30.2 109.9 93.6
Safety and Security Systems | Industrial signaling equipment        
Disaggregation of Revenue [Line Items]        
Net sales 16.7 12.2 46.0 39.9
Safety and Security Systems | Warning systems        
Disaggregation of Revenue [Line Items]        
Net sales $ 8.6 $ 6.8 $ 22.1 $ 19.8
[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.