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REVENUES FROM CONTRACTS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 369.3	$ 343.6
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	214.9	221.6
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	154.4	122.0
Cooling
Disaggregation of Revenue [Line Items]
Revenues	57.9	58.9
Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	60.6	69.5
Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	48.7	47.1
Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	43.2	38.0
Power transformers
Disaggregation of Revenue [Line Items]
Revenues	110.6	98.8
Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	46.2	42.9
South African projects
Disaggregation of Revenue [Line Items]
Revenues	2.1	(11.6)
HVAC
Disaggregation of Revenue [Line Items]
Revenues	118.5	128.4
HVAC | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	118.5	128.4
HVAC | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
HVAC | Cooling
Disaggregation of Revenue [Line Items]
Revenues	57.9	58.9
HVAC | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	60.6	69.5
HVAC | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
HVAC | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
HVAC | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
HVAC | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
HVAC | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Detection and Measurement
Disaggregation of Revenue [Line Items]
Revenues	91.9	85.1
Detection and Measurement | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	83.5	79.6
Detection and Measurement | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	8.4	5.5
Detection and Measurement | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Detection and Measurement | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Detection and Measurement | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	48.7	47.1
Detection and Measurement | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	43.2	38.0
Detection and Measurement | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Detection and Measurement | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Detection and Measurement | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Engineered Solutions
Disaggregation of Revenue [Line Items]
Revenues	154.9	138.0
Engineered Solutions | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	11.6	12.5
Engineered Solutions | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	143.3	125.5
Engineered Solutions | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Engineered Solutions | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Engineered Solutions | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Engineered Solutions | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
Engineered Solutions | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	110.6	98.8
Engineered Solutions | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	44.3	39.2
Engineered Solutions | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
All Other
Disaggregation of Revenue [Line Items]
Revenues	4.0	(7.9)
All Other | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	1.3	1.1
All Other | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	2.7	(9.0)
All Other | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
All Other | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
All Other | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
All Other | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
All Other | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0
All Other | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	1.9	3.7
All Other | South African projects
Disaggregation of Revenue [Line Items]
Revenues	$ 2.1	$ (11.6)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
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-Topic 606
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-Section 50
-Paragraph 5
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