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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Changes in the carrying amount of goodwill |  |
Gross goodwill, beginning of the period | $ 1,210.4 | $ 954.7
Accumulated impairment, balance at the beginning of the period | (505.6) | (499.4)
Goodwill, balance at the beginning of the period | 704.8 | 455.3
Goodwill resulting from business combinations | 148.0 | 243.2
Impairments | 0.0 | 0.0
Gross goodwill related to foreign currency translation | (24.5) | 12.5
Accumulated impairments related to foreign currency translation | 6.2 | (6.2)
Goodwill related to foreign currency translation | (18.3) | 6.3
Gross goodwill, end of the period | 1,333.9 | 1,210.4
Accumulated impairment, balance at the end of the period | (499.4) | (505.6)
Goodwill, balance at the end of the period | 834.5 | 704.8
T. A. Morrison & Co. Inc. (TAMCO) |  |
Changes in the carrying amount of goodwill |  |
Goodwill resulting from business combinations |  | 51.3
Goodwill, period increase (decrease) | 1.7 |
ASPEQ Parent Holdings, Inc. |  |
Changes in the carrying amount of goodwill |  |
Goodwill resulting from business combinations |  | 191.1
Goodwill, period increase (decrease) | 3.9 |
ITL |  |
Changes in the carrying amount of goodwill |  |
Goodwill, period increase (decrease) |  | 0.8
Ingénia Technologies Inc. |  |
Changes in the carrying amount of goodwill |  |
Goodwill resulting from business combinations | 142.4 |
Goodwill, balance at the end of the period | 133.6 |
External revenues |  |
Changes in the carrying amount of goodwill |  |
Gross goodwill, beginning of the period | 777.8 | 529.5
Accumulated impairment, balance at the beginning of the period | (331.9) | (328.2)
Goodwill, balance at the beginning of the period | 445.9 | 201.3
Goodwill resulting from business combinations | 148.0 | 242.4
Impairments | 0.0 | 0.0
Gross goodwill related to foreign currency translation | (18.5) | 5.9
Accumulated impairments related to foreign currency translation | 5.3 | (3.7)
Goodwill related to foreign currency translation | (13.2) | 2.2
Gross goodwill, end of the period | 907.3 | 777.8
Accumulated impairment, balance at the end of the period | (326.6) | (331.9)
Goodwill, balance at the end of the period | 580.7 | 445.9
Detection and Measurement reportable segment |  |
Changes in the carrying amount of goodwill |  |
Gross goodwill, beginning of the period | 432.6 | 425.2
Accumulated impairment, balance at the beginning of the period | (173.7) | (171.2)
Goodwill, balance at the beginning of the period | 258.9 | 254.0
Goodwill resulting from business combinations | 0.0 | 0.8
Impairments | 0.0 | 0.0
Gross goodwill related to foreign currency translation | (6.0) | 6.6
Accumulated impairments related to foreign currency translation | 0.9 | (2.5)
Goodwill related to foreign currency translation | (5.1) | 4.1
Gross goodwill, end of the period | 426.6 | 432.6
Accumulated impairment, balance at the end of the period | (172.8) | (173.7)
Goodwill, balance at the end of the period | $ 253.8 | $ 258.9

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