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Revenue Recognition - Disaggregation of Revenue From Contracts With Customers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Net sales $ 286.1 $ 273.8
U.S.    
Disaggregation of Revenue [Line Items]    
Net sales 226.6 204.8
Canada    
Disaggregation of Revenue [Line Items]    
Net sales 33.5 44.4
Europe/Other    
Disaggregation of Revenue [Line Items]    
Net sales 26.0 24.6
Environmental Solutions    
Disaggregation of Revenue [Line Items]    
Net sales 233.0 219.5
Environmental Solutions | Vehicles and equipment    
Disaggregation of Revenue [Line Items]    
Net sales [1] 186.1 173.7
Environmental Solutions | Parts    
Disaggregation of Revenue [Line Items]    
Net sales 33.4 31.1
Environmental Solutions | Rental income    
Disaggregation of Revenue [Line Items]    
Net sales [2] 8.8 9.6
Environmental Solutions | Other    
Disaggregation of Revenue [Line Items]    
Net sales [3] 4.7 5.1
Safety and Security Systems    
Disaggregation of Revenue [Line Items]    
Net sales 53.1 54.3
Safety and Security Systems | Public safety and security equipment    
Disaggregation of Revenue [Line Items]    
Net sales 31.8 32.4
Safety and Security Systems | Industrial signaling equipment    
Disaggregation of Revenue [Line Items]    
Net sales 14.3 13.8
Safety and Security Systems | Warning systems    
Disaggregation of Revenue [Line Items]    
Net sales $ 7.0 $ 8.1
[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.