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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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