REVENUES FROM CONTRACTS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 364.8			$ 362.5	$ 1,080.8	$ 1,093.6
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	244.1			228.6	706.1	663.1
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	120.7			133.9	374.7	430.5
Cooling
Disaggregation of Revenue [Line Items]
Revenues	68.4			65.1	194.3	201.6
Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	71.7			66.9	205.1	197.8
Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues	45.0			49.8	144.7	110.7
Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	52.6			34.5	139.7	113.8
Power transformers
Disaggregation of Revenue [Line Items]
Revenues	93.4			89.4	296.8	274.9
Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	28.6			47.0	109.0	156.0
South African projects
Disaggregation of Revenue [Line Items]
Revenues	5.1			9.8	(8.8)	38.8
HVAC
Disaggregation of Revenue [Line Items]
Revenues	140.1			132.0	399.4	399.4
HVAC | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	140.1			132.0	399.4	399.4
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	68.4			65.1	194.3	201.6
HVAC | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	71.7			66.9	205.1	197.8
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	97.6			84.3	284.4	224.5
Detection and Measurement | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	91.0			79.5	266.7	215.6
Detection and Measurement | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	6.6			4.8	17.7	8.9
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	45.0			49.8	144.7	110.7
Detection and Measurement | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	52.6			34.5	139.7	113.8
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	121.1			124.8	398.1	388.0
Engineered Solutions | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	12.6			15.2	38.0	43.5
Engineered Solutions | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	108.5			109.6	360.1	344.5
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	93.4			89.4	296.8	274.9
Engineered Solutions | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	27.7			35.4	101.3	113.1
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	6.0			21.4	(1.1)	81.7
All Other | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	0.4			1.9	2.0	4.6
All Other | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	5.6			19.5	(3.1)	77.1
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	0.9			11.6	7.7	42.9
All Other | South African projects
Disaggregation of Revenue [Line Items]
Revenues	5.1			$ 9.8	(8.8)	$ 38.8
South Africa | Operating Segments | Large Power Projects | Contracts Accounted for under Percentage of Completion | All Other
Disaggregation of Revenue [Line Items]
Revenues		$ (6.0)	$ (17.5)
South Africa | Operating Segments | Large Power Projects | Contracts Accounted for under Percentage of Completion | All Other | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	$ 9.8				$ (23.5)