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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | $ 490.4 |  | $ 442.4 |  | $ 915.3 | $ 827.9
U.S. |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 384.4 |  | 338.9 |  | 718.7 | 648.0
Canada |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 69.4 |  | 69.4 |  | 128.7 | 113.3
Europe/Other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 36.6 |  | 34.1 |  | 67.9 | 66.6
Environmental Solutions |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 408.8 |  | 373.0 |  | 762.8 | 691.8
Environmental Solutions | Vehicles and equipment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 318.6 | [1] | 285.0 | [1] | 590.9 | 530.3
Environmental Solutions | Parts |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 60.1 |  | 59.6 |  | 121.1 | 114.4
Environmental Solutions | Rental income |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 17.4 | [2] | 16.9 | [2] | 29.4 | 27.9
Environmental Solutions | Other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 12.7 | [3] | 11.5 | [3] | 21.4 | 19.2
Safety and Security Systems |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 81.6 |  | 69.4 |  | 152.5 | 136.1
Safety and Security Systems | Public safety and security equipment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 53.1 |  | 42.4 |  | 98.0 | 82.6
Safety and Security Systems | Industrial signaling equipment |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | 17.6 |  | 18.7 |  | 34.5 | 37.3
Safety and Security Systems | Warning systems |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net sales | $ 10.9 |  | $ 8.3 |  | $ 20.0 | $ 16.2
[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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