INFORMATION ON REPORTABLE AND OTHER OPERATING SEGMENTS (Details) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 26, 2020 USD ($) country	Sep. 28, 2019 USD ($)	Mar. 30, 2019 USD ($)	Sep. 26, 2020 USD ($) country	Sep. 28, 2019 USD ($)
Information on reportable segments and other operating segments
Number of countries in which entity operates (over 15 countries) | country	17			17
Revenues:
Revenues	$ 363.4	$ 364.8		$ 1,105.9	$ 1,080.8
Income (loss):
Consolidated operating income	30.0	27.6		97.1	56.9
Special charges, net	(0.4)	(2.0)		(2.1)	(3.4)
Other operating income (expense)	0.0	0.0		0.4	(1.8)
Operating Segments
Revenues:
Revenues	363.4	364.8		1,105.9	1,080.8
Income (loss):
Consolidated operating income	44.2	42.9		139.0	105.1
Corporate expense
Income (loss):
Consolidated operating income	(10.4)	(10.0)		(30.0)	(32.9)
Special charges, net	(0.4)	(0.2)		(0.9)	(0.2)
Segment Reconciling Items
Income (loss):
Long-term incentive compensation expense	(3.4)	(3.3)		(10.2)	(10.1)
Special charges, net	(0.4)	(2.0)		(2.1)	(3.4)
Other operating income (expense)	0.0	0.0		0.4	(1.8)
HVAC reportable segment
Revenues:
Revenues	154.6	140.1		405.4	399.4
HVAC reportable segment | Operating Segments
Revenues:
Revenues	154.6	140.1		405.4	399.4
Income (loss):
Consolidated operating income	26.3	22.2		59.5	57.3
Special charges, net	0.0	(0.1)		(0.5)	(0.8)
Detection and Measurement reportable segment
Revenues:
Revenues	85.2	97.6		269.2	284.4
Detection and Measurement reportable segment | Operating Segments
Revenues:
Revenues	85.2	97.6		269.2	284.4
Income (loss):
Consolidated operating income	14.2	20.5		48.4	59.2
Special charges, net	0.0	0.0		(0.1)	0.0
Engineered Solutions reportable segment
Revenues:
Revenues	123.1	121.1		424.8	398.1
Engineered Solutions reportable segment | Operating Segments
Revenues:
Revenues	123.1	121.1		424.8	398.1
Income (loss):
Consolidated operating income	9.2	5.9		44.7	26.9
Special charges, net	0.0	(0.3)		0.0	(0.7)
All Other
Revenues:
Revenues	0.5	6.0		6.5	(1.1)
All Other | Operating Segments
Revenues:
Revenues	0.5	6.0		6.5	(1.1)
Income (loss):
Consolidated operating income	(5.5)	(5.7)		(13.6)	(38.3)
Special charges, net	$ 0.0	$ (1.4)		$ (0.6)	(1.7)
Minimum
Information on reportable segments and other operating segments
Number of countries in which entity sells its products and services (over 100 countries) | country	100			100
Contracts Accounted for under Percentage of Completion | South Africa | Large Power Projects | All Other
Revenues:
Revenues			$ (17.5)	$ 0.3	$ (23.5)