Information on Reportable Segments - Financial Data (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Oct. 02, 2021	Jul. 03, 2021	Apr. 03, 2021	Dec. 31, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Revenues	$ 350.0	$ 285.7	$ 296.6	$ 287.2	$ 348.3	$ 267.8	$ 257.3	$ 254.7	$ 1,219.5	$ 1,128.1	$ 1,123.6
Income:
Consolidated operating income									73.7	96.9	114.0
Impairment of goodwill and intangible assets									5.7	0.7	0.0
Special charges, net									1.0	2.4	1.5
Capital expenditures:
Total capital expenditures									9.6	15.3	13.5
Depreciation and amortization:
Total depreciation and amortization									42.3	31.9	24.4
Identifiable assets:
Total identifiable assets	2,628.6				2,333.7				2,628.6	2,333.7	2,167.8
Tangible Long-Lived Assets:
Long-lived assets of continuing operations	800.2				722.4				800.2	722.4	723.7
Long-lived assets of discontinued operations, DBT and Heat Transfer	28.0				109.1				28.0	109.1	95.7
Total tangible long-lived assets	828.2				831.5				828.2	831.5	819.4
Recorded charges related to asbestos product liability matters	46.3				19.1				51.2	21.3	10.1
Enterprise Control Systems Ltd
Tangible Long-Lived Assets:
Contingent consideration, reversal of liability	6.7								6.7
Discontinued operations
Identifiable assets:
Discontinued operations	52.2				387.0				52.2	387.0	361.3
United States
Revenues:
Revenues									991.5	935.7	972.7
Tangible Long-Lived Assets:
Total tangible long-lived assets	762.4				695.6				762.4	695.6	682.3
China
Revenues:
Revenues									57.9	41.7	31.1
United Kingdom
Revenues:
Revenues									80.1	88.4	59.0
Other
Revenues:
Revenues									90.0	62.3	60.8
Tangible Long-Lived Assets:
Total tangible long-lived assets	37.8				26.8				37.8	26.8	41.4
Operating Segments
Revenues:
Revenues									1,219.5	1,128.1	1,123.6
Income:
Consolidated operating income									173.9	171.8	184.9
Corporate
Income:
Corporate expense									60.5	49.7	55.0
Special charges, net										1.6	0.2
Capital expenditures:
Total capital expenditures									0.9	5.6	2.5
Depreciation and amortization:
Total depreciation and amortization									2.8	3.3	3.0
Identifiable assets:
Total identifiable assets	406.4				45.6				406.4	45.6	33.5
Segment Reconciling Items
Income:
Long-term incentive compensation expense									12.8	13.1	12.6
Impairment of goodwill and intangible assets									5.7	0.7	0.0
Special charges, net									1.0	2.4	1.5
Other operating expenses, net									20.2	9.0	1.8
Identifiable assets:
Insurance recovery assets	526.2				496.4				526.2	496.4	509.6
Tangible Long-Lived Assets:
Recorded charges related to asbestos product liability matters									26.3	9.4
Contingent consideration, reversal of liability	0.6								0.6
Gain on contract termination										0.4
Revisions to estimates of certain liabilities for divestitures											1.8
HVAC reportable segment
Revenues:
Revenues									752.1	740.8	738.7
HVAC reportable segment | Operating Segments
Revenues:
Revenues									752.1	740.8	738.7
Income:
Consolidated operating income									104.2	102.7	103.2
Special charges, net									0.1	0.5	1.3
Capital expenditures:
Total capital expenditures									5.3	7.0	8.7
Depreciation and amortization:
Total depreciation and amortization									11.5	11.0	8.2
Identifiable assets:
Total identifiable assets	808.4				632.2				808.4	632.2	654.0
Detection and Measurement reportable segment
Revenues:
Revenues									467.4	387.3	384.9
Detection and Measurement reportable segment | Operating Segments
Revenues:
Revenues									467.4	387.3	384.9
Income:
Consolidated operating income									69.7	69.1	81.7
Special charges, net									0.9	0.3	0.0
Capital expenditures:
Total capital expenditures									3.4	2.7	2.3
Depreciation and amortization:
Total depreciation and amortization									28.0	17.6	13.2
Identifiable assets:
Total identifiable assets	$ 835.4				$ 772.5				$ 835.4	$ 772.5	$ 609.4