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Business Segments and Geographic Information - Schedule of Information on Company's Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenues $ 878.7 $ 798.2 $ 2,558.4 $ 2,405.9
Adjusted segment cost of sales (488.1) (444.3) (1,406.7) (1,327.8)
Adjusted segment cost of sales (487.5) (442.2) (1,406.1) (1,323.2)
Interest expense – net (16.5) (10.3) (48.2) (27.8)
Depreciation (19.1) (17.4) (56.5) (49.9)
Amortization of intangible assets (33.0) (26.5) (96.5) (75.0)
Fair value inventory step-up charges (0.6) (2.1) (0.6) (4.6)
Restructuring expenses and asset impairments (0.1) (3.0) (18.3) (5.4)
Gain on sale of business 0.0 (0.6) 0.0 4.0
Income before income taxes 170.5 154.4 464.9 488.1
STC,LLC        
Segment Reporting Information [Line Items]        
Fair value inventory step-up charges       4.6
HST        
Segment Reporting Information [Line Items]        
Revenues 380.1 309.9 1,084.1 922.3
FMT        
Segment Reporting Information [Line Items]        
Revenues 316.8 300.6 917.5 933.0
Income before income taxes 170.5 154.4    
Fire & Safety/Diversified Products        
Segment Reporting Information [Line Items]        
Revenues 181.8 187.7 556.8 550.6
Eliminations        
Segment Reporting Information [Line Items]        
Revenues (1.3) (1.6) (5.6) (4.3)
Adjusted segment cost of sales 1.3 1.6 5.6 4.3
Eliminations | HST        
Segment Reporting Information [Line Items]        
Revenues (0.9) (1.1) (3.7) (2.6)
Eliminations | FMT        
Segment Reporting Information [Line Items]        
Revenues (0.3) (0.2) (1.0) (0.9)
Eliminations | Fire & Safety/Diversified Products        
Segment Reporting Information [Line Items]        
Revenues (0.1) (0.3) (0.9) (0.8)
Operating segments        
Segment Reporting Information [Line Items]        
Revenues 880.0 799.8 2,564.0 2,410.2
Adjusted segment cost of sales (488.8) (443.8) (1,411.7) (1,327.5)
Other segment expenses (129.7) (120.2) (393.8) (363.0)
Segment Adjusted EBITDA 261.5 235.8 758.5 719.7
Depreciation (18.9) (17.1) (55.9) (49.1)
Operating segments | HST        
Segment Reporting Information [Line Items]        
Revenues 381.0 311.0 1,087.8 924.9
Adjusted segment cost of sales (223.3) (184.1) (641.5) (546.0)
Other segment expenses (52.3) (44.3) (158.5) (130.7)
Segment Adjusted EBITDA 105.4 82.6 287.8 248.2
Depreciation (11.9) (10.6) (35.5) (29.5)
Amortization of intangible assets (26.2) (19.7) (76.2) (54.6)
Operating segments | FMT        
Segment Reporting Information [Line Items]        
Revenues 317.1 300.8 918.5 933.9
Adjusted segment cost of sales (161.8) (155.4) (461.1) (478.7)
Other segment expenses (48.5) (46.9) (146.6) (143.6)
Segment Adjusted EBITDA 106.8 98.5 310.8 311.6
Depreciation (4.7) (4.3) (13.5) (12.9)
Amortization of intangible assets (5.5) (5.2) (16.2) (15.7)
Operating segments | Fire & Safety/Diversified Products        
Segment Reporting Information [Line Items]        
Revenues 181.9 188.0 557.7 551.4
Adjusted segment cost of sales (103.7) (104.3) (309.1) (302.8)
Other segment expenses (28.9) (29.0) (88.7) (88.7)
Segment Adjusted EBITDA 49.3 54.7 159.9 159.9
Depreciation (2.3) (2.2) (6.9) (6.7)
Amortization of intangible assets (1.3) (1.6) (4.1) (4.7)
Corporate/other        
Segment Reporting Information [Line Items]        
Segment Adjusted EBITDA (21.7) (21.5) (73.5) (72.9)
Depreciation (0.2) (0.3) (0.6) (0.8)
Amortization of intangible assets $ (33.0) $ (26.5) $ (96.5) $ (75.0)