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Revenue Recognition - Disaggregation of Revenue From Contracts With Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | $ 564.6 | $ 490.4 |  | $ 1,028.4 | $ 915.3
U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 445.2 | 384.4 |  | 809.7 | 718.7
Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 79.2 | 69.4 |  | 140.7 | 128.7
Europe/Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 40.2 | 36.6 |  | 78.0 | 67.9
Environmental Solutions |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 480.5 | 408.8 |  | 867.9 | 762.8
Environmental Solutions | Vehicles and equipment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 374.5 | 318.6 | [1] | 676.1 | 590.9
Environmental Solutions | Parts |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 68.2 | 60.1 |  | 128.3 | 121.1
Environmental Solutions | Rental income |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 20.4 | 17.4 | [2] | 35.4 | 29.4
Environmental Solutions | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 17.4 | 12.7 | [3] | 28.1 | 21.4
Safety and Security Systems |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 84.1 | 81.6 |  | 160.5 | 152.5
Safety and Security Systems | Public safety and security equipment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 52.9 | 53.1 |  | 103.5 | 98.0
Safety and Security Systems | Industrial signaling equipment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | 17.5 | 17.6 |  | 34.1 | 34.5
Safety and Security Systems | Warning systems |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net sales | $ 13.7 | $ 10.9 |  | $ 22.9 | $ 20.0
[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.

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