INFORMATION ON REPORTABLE SEGMENTS - Financial Data (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Revenues:
Revenues	$ 307.1	$ 287.2
Income:
Consolidated operating income	11.4	25.0
Special charges, net	0.0	0.2
Other operating income	0.9	0.0
HVAC reportable segment
Revenues:
Revenues	193.1	175.6
Detection and Measurement reportable segment
Revenues:
Revenues	114.0	111.6
Operating Segments
Revenues:
Revenues	307.1	287.2
Income:
Consolidated operating income	30.2	42.3
Operating Segments | HVAC reportable segment
Revenues:
Revenues	193.1	175.6
Income:
Consolidated operating income	15.2	22.3
Special charges, net	0.0	0.0
Operating Segments | Detection and Measurement reportable segment
Revenues:
Revenues	114.0	111.6
Income:
Consolidated operating income	15.0	20.0
Special charges, net	0.0	0.2
Corporate expense
Income:
Corporate expense	16.6	14.4
Special charges, net	0.0	0.0
Segment Reconciling Items
Income:
Long-term incentive compensation expense	3.1	2.7
Special charges, net	0.0	0.2
Other operating income	$ (0.9)	$ 0.0