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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)

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