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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Net sales $ 555.0 $ 474.2 $ 1,583.4 $ 1,389.5
U.S.        
Disaggregation of Revenue [Line Items]        
Net sales 441.3 379.9 1,251.0 1,098.6
Canada        
Disaggregation of Revenue [Line Items]        
Net sales 71.1 60.7 211.8 189.4
Europe/Other        
Disaggregation of Revenue [Line Items]        
Net sales 42.6 33.6 120.6 101.5
Environmental Solutions        
Disaggregation of Revenue [Line Items]        
Net sales 465.5 398.2 1,333.4 1,161.0
Environmental Solutions | Vehicles and equipment        
Disaggregation of Revenue [Line Items]        
Net sales 355.3 308.6 [1] 1,031.4 899.5
Environmental Solutions | Parts        
Disaggregation of Revenue [Line Items]        
Net sales 70.7 56.8 199.0 177.9
Environmental Solutions | Rental income        
Disaggregation of Revenue [Line Items]        
Net sales 18.5 15.4 [2] 53.9 44.8
Environmental Solutions | Other        
Disaggregation of Revenue [Line Items]        
Net sales 21.0 17.4 [3] 49.1 38.8
Safety and Security Systems        
Disaggregation of Revenue [Line Items]        
Net sales 89.5 76.0 250.0 228.5
Safety and Security Systems | Public safety and security equipment        
Disaggregation of Revenue [Line Items]        
Net sales 57.2 48.2 160.7 146.2
Safety and Security Systems | Industrial signaling equipment        
Disaggregation of Revenue [Line Items]        
Net sales 18.0 17.9 52.1 52.4
Safety and Security Systems | Warning systems        
Disaggregation of Revenue [Line Items]        
Net sales $ 14.3 $ 9.9 $ 37.2 $ 29.9
[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.