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REVENUES FROM CONTRACTS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 351.9	$ 340.6
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	205.6
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	146.3
Cooling
Disaggregation of Revenue [Line Items]
Revenues	59.6
Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	68.1
Underground locators and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	25.8
Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	39.8
Power transformers
Disaggregation of Revenue [Line Items]
Revenues	91.3
Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	53.0
South African projects
Disaggregation of Revenue [Line Items]
Revenues	14.3
HVAC segment
Disaggregation of Revenue [Line Items]
Revenues	127.7	110.1
HVAC segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	127.7
HVAC segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	0.0
HVAC segment | Cooling
Disaggregation of Revenue [Line Items]
Revenues	59.6
HVAC segment | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	68.1
HVAC segment | Underground locators and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0
HVAC segment | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0
HVAC segment | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0
HVAC segment | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0
HVAC segment | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0
Detection and Measurement segment
Disaggregation of Revenue [Line Items]
Revenues	65.6	53.6
Detection and Measurement segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	64.0
Detection and Measurement segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	1.6
Detection and Measurement segment | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0
Detection and Measurement segment | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0
Detection and Measurement segment | Underground locators and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	25.8
Detection and Measurement segment | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	39.8
Detection and Measurement segment | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	0.0
Detection and Measurement segment | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	0.0
Detection and Measurement segment | South African projects
Disaggregation of Revenue [Line Items]
Revenues	0.0
Engineered Solutions segment
Disaggregation of Revenue [Line Items]
Revenues	158.6	$ 176.9
Engineered Solutions segment | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues	13.9
Engineered Solutions segment | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues	144.7
Engineered Solutions segment | Cooling
Disaggregation of Revenue [Line Items]
Revenues	0.0
Engineered Solutions segment | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues	0.0
Engineered Solutions segment | Underground locators and inspection equipment
Disaggregation of Revenue [Line Items]
Revenues	0.0
Engineered Solutions segment | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues	0.0
Engineered Solutions segment | Power transformers
Disaggregation of Revenue [Line Items]
Revenues	91.3
Engineered Solutions segment | Process cooling equipment and services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues	53.0
Engineered Solutions segment | South African projects
Disaggregation of Revenue [Line Items]
Revenues	$ 14.3

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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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