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Revenue Recognition - Disaggregation of Revenue From Contracts With Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]    
Net sales $ 1,221.3 $ 1,089.5
Environmental Solutions    
Disaggregation of Revenue [Line Items]    
Net sales 992.9 863.5
Environmental Solutions | Vehicles and equipment    
Disaggregation of Revenue [Line Items]    
Net sales [1] 788.7 687.2
Environmental Solutions | Parts    
Disaggregation of Revenue [Line Items]    
Net sales 132.8 118.6
Environmental Solutions | Rental income    
Disaggregation of Revenue [Line Items]    
Net sales [2] 46.2 41.8
Environmental Solutions | Other    
Disaggregation of Revenue [Line Items]    
Net sales [3] 25.2 15.9
Safety And Security Systems    
Disaggregation of Revenue [Line Items]    
Net sales 228.4 226.0
Safety And Security Systems | Public safety and security equipment    
Disaggregation of Revenue [Line Items]    
Net sales 133.5 134.3
Safety And Security Systems | Industrial signaling equipment    
Disaggregation of Revenue [Line Items]    
Net sales 59.3 53.4
Safety And Security Systems | Warning systems    
Disaggregation of Revenue [Line Items]    
Net sales $ 35.6 $ 38.3
[1]
Includes net sales from the sale of new and used vehicles and equipment, including sales of rental equipment.
[2]
Represents revenues from vehicle and equipment lease arrangements with customers, recognized in accordance with Topic 842 and Topic 840, as applicable.
[3]
Primarily includes revenues from services such as maintenance and repair work and the sale of extended warranty contracts.