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Business Segments and Geographic Information - Schedule of Information on Company's Business Segments (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenues $ 865,400,000 $ 807,200,000 $ 1,679,700,000 $ 1,607,700,000
Adjusted segment cost of sales (473,200,000) (440,400,000) (918,600,000) (883,500,000)
Adjusted segment cost of sales (473,200,000) (440,400,000) (918,600,000) (881,000,000.0)
Interest expense – net (15,600,000) (8,100,000) (31,700,000) (17,500,000)
Depreciation (19,000,000.0) (16,300,000) (37,400,000) (32,500,000)
Amortization of intangible assets (32,000,000) (23,900,000) (63,500,000) (48,500,000)
Fair value inventory step-up charges 0 0 0 (2,500,000)
Restructuring expenses and asset impairments (700,000) (1,300,000) (18,200,000) (2,400,000)
Gain on sale of business 0 4,600,000 0 4,600,000
Income before income taxes 169,900,000 179,200,000 294,400,000 333,700,000
STC,LLC        
Segment Reporting Information [Line Items]        
Inventory adjustment 0 0 0 2,500,000
HST        
Segment Reporting Information [Line Items]        
Revenues 363,900,000 303,000,000.0 704,000,000.0 612,400,000
FMT        
Segment Reporting Information [Line Items]        
Revenues 310,500,000 318,900,000 600,700,000 632,400,000
Income before income taxes 169,900,000 179,200,000    
Fire & Safety/Diversified Products        
Segment Reporting Information [Line Items]        
Revenues 191,000,000.0 185,300,000 375,000,000.0 362,900,000
Eliminations        
Segment Reporting Information [Line Items]        
Revenues (2,300,000) (1,400,000) (4,300,000) (2,700,000)
Adjusted segment cost of sales 2,300,000 1,400,000 4,300,000 2,700,000
Eliminations | HST        
Segment Reporting Information [Line Items]        
Revenues (1,400,000) (800,000) (2,800,000) (1,500,000)
Eliminations | FMT        
Segment Reporting Information [Line Items]        
Revenues (400,000) (500,000) (700,000) (700,000)
Eliminations | Fire & Safety/Diversified Products        
Segment Reporting Information [Line Items]        
Revenues (500,000) (100,000) (800,000) (500,000)
Operating segments        
Segment Reporting Information [Line Items]        
Revenues 867,700,000 808,600,000 1,684,000,000 1,610,400,000
Adjusted segment cost of sales (475,500,000) (441,800,000) (922,900,000) (883,700,000)
Other segment expenses (132,100,000) (121,100,000) (264,100,000) (242,800,000)
Segment Adjusted EBITDA 260,100,000 245,700,000 497,000,000.0 483,900,000
Depreciation (18,700,000) (16,000,000.0) (37,000,000.0) (32,000,000.0)
Operating segments | HST        
Segment Reporting Information [Line Items]        
Revenues 365,300,000 303,800,000 706,800,000 613,900,000
Adjusted segment cost of sales (217,000,000.0) (177,600,000) (418,200,000) (361,900,000)
Other segment expenses (53,300,000) (42,000,000.0) (106,200,000) (86,400,000)
Segment Adjusted EBITDA 95,000,000.0 84,200,000 182,400,000 165,600,000
Depreciation (11,900,000) (9,500,000) (23,600,000) (18,900,000)
Amortization of intangible assets (25,400,000) (17,200,000) (50,000,000.0) (34,900,000)
Operating segments | FMT        
Segment Reporting Information [Line Items]        
Revenues 310,900,000 319,400,000 601,400,000 633,100,000
Adjusted segment cost of sales (153,000,000.0) (163,300,000) (299,300,000) (323,300,000)
Other segment expenses (49,200,000) (48,400,000) (98,100,000) (96,700,000)
Segment Adjusted EBITDA 108,700,000 107,700,000 204,000,000.0 213,100,000
Depreciation (4,400,000) (4,300,000) (8,800,000) (8,600,000)
Amortization of intangible assets (5,400,000) (5,200,000) (10,700,000) (10,500,000)
Operating segments | Fire & Safety/Diversified Products        
Segment Reporting Information [Line Items]        
Revenues 191,500,000 185,400,000 375,800,000 363,400,000
Adjusted segment cost of sales (105,500,000) (100,900,000) (205,400,000) (198,500,000)
Other segment expenses (29,600,000) (30,700,000) (59,800,000) (59,700,000)
Segment Adjusted EBITDA 56,400,000 53,800,000 110,600,000 105,200,000
Depreciation (2,400,000) (2,200,000) (4,600,000) (4,500,000)
Amortization of intangible assets (1,200,000) (1,500,000) (2,800,000) (3,100,000)
Corporate/other        
Segment Reporting Information [Line Items]        
Segment Adjusted EBITDA (22,900,000) (21,500,000) (51,800,000) (51,400,000)
Depreciation (300,000) (300,000) (400,000) (500,000)
Amortization of intangible assets $ (32,000,000.0) $ (23,900,000) $ (63,500,000) $ (48,500,000)