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REVENUES FROM CONTRACTS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 379.2	$ 349.7	$ 731.1	$ 690.3
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	228.9		434.5
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	150.3		296.6
Cooling
Disaggregation of Revenue [Line Items]
Revenues	76.9		136.5
Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	62.8		130.9
Underground locators and rehabilitation and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	35.1		60.9
Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	39.5		79.3
Power transformers
Disaggregation of Revenue [Line Items]
Revenues	94.2		185.5
Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	56.0		109.0
South African projects
Disaggregation of Revenue [Line Items]
Revenues	14.7		29.0
HVAC segment
Disaggregation of Revenue [Line Items]
Revenues	139.7	120.3	267.4	230.4
HVAC segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	139.7		267.4
HVAC segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
HVAC segment | Cooling
Disaggregation of Revenue [Line Items]
Revenues	76.9		136.5
HVAC segment | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	62.8		130.9
HVAC segment | Underground locators and rehabilitation and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
HVAC segment | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
HVAC segment | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
HVAC segment | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
HVAC segment | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Detection and Measurement segment
Disaggregation of Revenue [Line Items]
Revenues	74.6	64.5	140.2	118.1
Detection and Measurement segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	72.1		136.1
Detection and Measurement segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	2.5		4.1
Detection and Measurement segment | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Detection and Measurement segment | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Detection and Measurement segment | Underground locators and rehabilitation and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	35.1		60.9
Detection and Measurement segment | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	39.5		79.3
Detection and Measurement segment | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Detection and Measurement segment | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Detection and Measurement segment | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Engineered Solutions segment
Disaggregation of Revenue [Line Items]
Revenues	164.9	$ 164.9	323.5	$ 341.8
Engineered Solutions segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	17.1		31.0
Engineered Solutions segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	147.8		292.5
Engineered Solutions segment | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Engineered Solutions segment | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Engineered Solutions segment | Underground locators and rehabilitation and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Engineered Solutions segment | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0		0.0
Engineered Solutions segment | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	94.2		185.5
Engineered Solutions segment | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	56.0		109.0
Engineered Solutions segment | South African projects
Disaggregation of Revenue [Line Items]
Revenues	$ 14.7		$ 29.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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