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Revenue Recognition - Disaggregation of Revenue From Contracts With Customers (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2019

Sep. 30, 2018

Sep. 30, 2019

Sep. 30, 2018

Disaggregation of Revenue [Line Items]

Net sales

$ 308.8

$ 269.4

$ 906.9

$ 810.1

U.S.

Disaggregation of Revenue [Line Items]

Net sales

252.6

215.2

705.6

632.5

Canada

Disaggregation of Revenue [Line Items]

Net sales

35.6

34.5

131.2

112.7

Europe/Other

Disaggregation of Revenue [Line Items]

Net sales

20.6

19.7

70.1

64.9

Environmental Solutions

Disaggregation of Revenue [Line Items]

Net sales

254.0

216.3

740.7

646.2

Environmental Solutions | Vehicles and equipment

Disaggregation of Revenue [Line Items]

Net sales

^[1]

198.3

170.9

585.7

511.7

Environmental Solutions | Parts

Disaggregation of Revenue [Line Items]

Net sales

34.4

30.0

101.0

92.2

Environmental Solutions | Rental income

Disaggregation of Revenue [Line Items]

Net sales

^[2]

12.1

11.2

35.1

30.6

Environmental Solutions | Other

Disaggregation of Revenue [Line Items]

Net sales

^[3]

9.2

4.2

18.9

11.7

Safety and Security Systems

Disaggregation of Revenue [Line Items]

Net sales

54.8

53.1

166.2

163.9

Safety and Security Systems | Public safety and security equipment

Disaggregation of Revenue [Line Items]

Net sales

31.6

29.7

98.6

97.0

Safety and Security Systems | Industrial signaling equipment

Disaggregation of Revenue [Line Items]

Net sales

15.1

13.2

45.1

39.9

Safety and Security Systems | Warning systems

Disaggregation of Revenue [Line Items]

Net sales

$ 8.1

$ 10.2

$ 22.5

$ 27.0

[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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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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