INFORMATION ON REPORTABLE SEGMENTS - Financial Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Revenues:
Revenues	$ 370.5	$ 285.7	$ 1,031.6	$ 869.5
Income:
Consolidated operating income	37.3	17.7	75.9	59.8
Impairment of goodwill and intangible assets	0.0	24.3	0.0	24.3
Special charges, net	0.0	(0.1)	0.1	0.7
Other operating (income) expense, net	0.0	(24.3)	1.0	(21.6)
HVAC reportable segment
Revenues:
Revenues	227.8	179.3	639.6	540.3
Detection and Measurement reportable segment
Revenues:
Revenues	142.7	106.4	392.0	329.2
Operating Segments
Revenues:
Revenues	370.5	285.7	1,031.6	869.5
Income:
Consolidated operating income	56.6	32.9	134.9	112.5
Operating Segments | HVAC reportable segment
Revenues:
Revenues	227.8	179.3	639.6	540.3
Income:
Consolidated operating income	30.9	23.0	71.7	71.2
Special charges, net	0.0	(0.1)	0.1	0.1
Operating Segments | Detection and Measurement reportable segment
Revenues:
Revenues	142.7	106.4	392.0	329.2
Income:
Consolidated operating income	25.7	9.9	63.2	41.3
Special charges, net	0.0	0.0	0.0	0.6
Corporate expense
Income:
Corporate expense	17.2	11.9	50.2	39.9
Segment Reconciling Items
Income:
Long-term incentive compensation expense	2.1	3.4	7.7	9.4
Impairment of goodwill and intangible assets	0.0	24.3	0.0	24.3
Special charges, net	0.0	(0.1)	0.1	0.7
Other operating (income) expense, net	$ 0.0	$ (24.3)	$ 1.0	$ (21.6)