REVENUES FROM CONTRACTS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 373.2	$ 372.4	$ 742.5	$ 716.0
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	230.3	240.4	445.2	462.0
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	142.9	132.0	297.3	254.0
Cooling
Disaggregation of Revenue [Line Items]
Revenues	76.6	67.0	134.5	125.9
Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	55.7	63.9	116.3	133.4
Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	47.3	52.6	96.0	99.7
Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	44.8	49.1	88.0	87.1
Power transformers
Disaggregation of Revenue [Line Items]
Revenues	113.9	104.6	224.5	203.4
Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	34.6	37.5	80.8	80.4
South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.3	(2.3)	2.4	(13.9)
HVAC
Disaggregation of Revenue [Line Items]
Revenues	132.3	130.9	250.8	259.3
HVAC | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	132.3	130.9	250.8	259.3
HVAC | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
HVAC | Cooling
Disaggregation of Revenue [Line Items]
Revenues	76.6	67.0	134.5	125.9
HVAC | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	55.7	63.9	116.3	133.4
HVAC | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
HVAC | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
HVAC | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
HVAC | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
HVAC | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Detection and Measurement
Disaggregation of Revenue [Line Items]
Revenues	92.1	101.7	184.0	186.8
Detection and Measurement | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	85.7	96.1	169.2	175.7
Detection and Measurement | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	6.4	5.6	14.8	11.1
Detection and Measurement | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Detection and Measurement | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Detection and Measurement | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	47.3	52.6	96.0	99.7
Detection and Measurement | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	44.8	49.1	88.0	87.1
Detection and Measurement | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	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	0.0	0.0
Detection and Measurement | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Engineered Solutions
Disaggregation of Revenue [Line Items]
Revenues	146.8	139.0	301.7	277.0
Engineered Solutions | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	11.6	12.9	23.2	25.4
Engineered Solutions | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	135.2	126.1	278.5	251.6
Engineered Solutions | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Engineered Solutions | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Engineered Solutions | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	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	0.0	0.0
Engineered Solutions | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	113.9	104.6	224.5	203.4
Engineered Solutions | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	32.9	34.4	77.2	73.6
Engineered Solutions | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
All Other
Disaggregation of Revenue [Line Items]
Revenues	2.0	0.8	6.0	(7.1)
All Other | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	0.7	0.5	2.0	1.6
All Other | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	1.3	0.3	4.0	(8.7)
All Other | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
All Other | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
All Other | Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	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	0.0	0.0
All Other | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
All Other | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	1.7	3.1	3.6	6.8
All Other | South African projects
Disaggregation of Revenue [Line Items]
Revenues	$ 0.3	$ (2.3)	$ 2.4	$ (13.9)