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INFORMATION ON REPORTABLE SEGMENTS AND CORPORATE EXPENSE - Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Dec. 31, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues $ 679.0 $ 552.4 $ 1,245.8 $ 1,035.0  
Cost of products sold 406.2 323.5 742.4 610.2  
Selling, general and administrative 129.9 117.2 249.3 226.7  
Consolidated operating income 115.0 86.6 202.7 153.2  
Acquisition and integration-related costs 4.6 8.3 12.3 16.9  
Long-term incentive compensation expense 4.3 3.9 8.0 7.6  
Amortization of acquired intangible assets 27.2 24.6 51.4 44.3  
Special charges, net 1.6 0.0 1.8 0.1  
Other operating expense, net 0.0 0.5 0.0 0.5  
Other income (expense), net (5.1) (2.1) (8.1) 0.6  
Interest expense 8.8 15.6 17.2 27.9  
Interest income 1.1 1.0 2.2 1.9  
Income (loss) from continuing operations before income taxes, noncontrolling interest 102.2 69.9 179.6 127.8  
Capital expenditures:          
Total capital expenditures 21.1 7.7 39.6 13.2  
Depreciation and amortization:          
Total depreciation and amortization 35.7 32.5 67.8 59.5  
Tangible Long-Lived Assets:          
Long-lived assets of continuing operations 581.5   581.5   $ 543.2
Long-lived assets of discontinued operations, DBT and Heat Transfer 0.0   0.0   0.0
Total tangible long-lived assets 581.5   581.5   543.2
Selling, general and administrative — intangible amortization 27.2 24.6 51.4 44.3  
Thermolec Ltd          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Amortization of acquired intangible assets 1.7   2.8    
Tangible Long-Lived Assets:          
Selling, general and administrative — intangible amortization 1.7   2.8    
Crawford United Corporation          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Amortization of acquired intangible assets 7.0   11.5    
Tangible Long-Lived Assets:          
Selling, general and administrative — intangible amortization 7.0   11.5    
Kranze Technology Solutions, Inc          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Amortization of acquired intangible assets   6.0   9.2  
Tangible Long-Lived Assets:          
Selling, general and administrative — intangible amortization   6.0   9.2  
Income Statement Location [Axis]: us-gaap:BusinessCombinationAcquisitionRelatedCosts          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Acquisition and integration-related costs 3.2 6.9 8.2 13.3  
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | Thermolec Ltd          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Acquisition and integration-related costs 0.4        
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | Crawford United Corporation          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Acquisition and integration-related costs     0.1    
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold | Kranze Technology Solutions, Inc          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Acquisition and integration-related costs   0.5   0.8  
Income Statement Location [Axis]: us-gaap:OperatingExpenses          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Acquisition and integration-related costs 1.4 1.4 4.1 3.6  
United States          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 538.0 438.9 985.6 841.9  
Tangible Long-Lived Assets:          
Total tangible long-lived assets 457.0   457.0   419.4
Canada          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 68.4 49.7 130.8 79.9  
Tangible Long-Lived Assets:          
Total tangible long-lived assets 87.6   87.6   88.2
China          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 23.5 21.7 40.5 34.7  
United Kingdom          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 21.6 22.5 42.9 39.9  
Other          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 27.5 19.6 46.0 38.6  
Tangible Long-Lived Assets:          
Total tangible long-lived assets 36.9   36.9   $ 35.6
Operating Segments          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Amortization of acquired intangible assets 0.9   1.8    
Capital expenditures:          
Total capital expenditures 21.1 7.7 39.4 13.2  
Depreciation and amortization:          
Total depreciation and amortization 35.2 31.9 66.7 58.3  
Tangible Long-Lived Assets:          
Selling, general and administrative — intangible amortization 0.9   1.8    
Corporate          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Corporate expense 15.8 13.3 30.3 27.3  
Capital expenditures:          
Total capital expenditures 0.0 0.0 0.2 0.0  
Depreciation and amortization:          
Total depreciation and amortization 0.5 0.6 1.1 1.2  
HVAC reportable segment | Operating Segments          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 480.6 376.7 874.6 699.7  
Cost of products sold 307.2 226.1 553.8 425.7  
Selling, general and administrative 63.6 54.8 122.4 104.3  
Consolidated operating income 109.8 95.8 198.4 169.7  
Capital expenditures:          
Total capital expenditures 18.9 6.1 35.2 10.8  
Depreciation and amortization:          
Total depreciation and amortization 25.2 18.9 47.1 35.8  
Detection and Measurement reportable segment | Operating Segments          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 198.4 175.7 371.2 335.3  
Cost of products sold 98.1 96.9 186.3 183.7  
Selling, general and administrative 43.0 38.8 80.9 75.0  
Consolidated operating income 57.3 40.0 104.0 76.6  
Capital expenditures:          
Total capital expenditures 2.2 1.6 4.2 2.4  
Depreciation and amortization:          
Total depreciation and amortization 10.0 13.0 19.6 22.5  
Segment Reporting          
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]          
Revenues 679.0 552.4 1,245.8 1,035.0  
Consolidated operating income $ 167.1 $ 135.8 $ 302.4 $ 246.3