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Revenues from Contracts (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 444.6	$ 364.8	$ 372.4	$ 343.6	$ 445.0	$ 362.5	$ 379.2	$ 351.9	$ 1,525.4	$ 1,538.6	$ 1,425.8
Contract accounts receivable	260.8								260.8			$ 263.9
Change in contract accounts receivable									(3.1)
Contract assets	63.4				91.2				63.4	91.2		91.2
Change in contract assets									(27.8)
Contract Liabilities - current	(100.8)				$ (79.5)				(100.8)	(79.5)		(79.5)
Change in contract liabilities - current									(21.3)
Contract liabilities - non-current	(3.3)								(3.3)			(2.1)
Change in contract liabilities - non-current									(1.2)
Net contract balance	$ 220.1								220.1			$ 273.5
Change in net contract balance									(53.4)
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues									1,001.7	956.0
Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues									523.7	582.6
Cooling
Disaggregation of Revenue [Line Items]
Revenues									284.2	281.7
Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues									309.0	300.4
Underground locators and inspection and rehabilitation equipment
Disaggregation of Revenue [Line Items]
Revenues									194.3	159.1
Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues									190.6	161.8
Power transformers
Disaggregation of Revenue [Line Items]
Revenues									403.4	373.8
Process cooling equipment, services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues									154.8	212.7
South African projects
Disaggregation of Revenue [Line Items]
Revenues									(10.9)	49.1
HVAC
Disaggregation of Revenue [Line Items]
Revenues									593.2	582.1	511.0
HVAC | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues									593.2	582.1
HVAC | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues									0.0	0.0
HVAC | Cooling
Disaggregation of Revenue [Line Items]
Revenues									284.2	281.7
HVAC | Boilers, comfort heating, and ventilation
Disaggregation of Revenue [Line Items]
Revenues									309.0	300.4
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, 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									384.9	320.9	260.3
Detection and Measurement | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues									357.1	307.3
Detection and Measurement | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues									27.8	13.6
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									194.3	159.1
Detection and Measurement | Signal monitoring, obstruction lighting, and bus fare collection systems
Disaggregation of Revenue [Line Items]
Revenues									190.6	161.8
Detection and Measurement | Power transformers
Disaggregation of Revenue [Line Items]
Revenues									0.0	0.0
Detection and Measurement | Process cooling equipment, 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									548.9	537.0	560.7
Engineered Solutions | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues									48.4	61.5
Engineered Solutions | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues									500.5	475.5
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									403.4	373.8
Engineered Solutions | Process cooling equipment, services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues									145.5	163.2
Engineered Solutions | South African projects
Disaggregation of Revenue [Line Items]
Revenues									0.0	0.0
All Other
Disaggregation of Revenue [Line Items]
Revenues									(1.6)	98.6	$ 93.8
All Other | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenues									3.0	5.1
All Other | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenues									(4.6)	93.5
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, services, and heat exchangers
Disaggregation of Revenue [Line Items]
Revenues									9.3	49.5
All Other | South African projects
Disaggregation of Revenue [Line Items]
Revenues									$ (10.9)	$ 49.1

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