Goodwill and other intangible assets - Goodwill by segments (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Sep. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Jan. 01, 2024 |
Dec. 31, 2023 |
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| Goodwill [Line Items] | ||||||
| Goodwill, gross | $ 5,810.7 | $ 5,810.7 | $ 5,578.0 | $ 5,755.5 | ||
| Accumulated impairment losses | (823.8) | (823.8) | (38.8) | (38.8) | ||
| Goodwill, net | 4,986.9 | 4,986.9 | 5,539.2 | 5,716.7 | $ 5,716.7 | |
| Impairment loss | 785.0 | $ 785.0 | $ 785.0 | |||
| Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Impairment charges | |||||
| Laboratory Solutions | ||||||
| Goodwill [Line Items] | ||||||
| Goodwill, gross | 3,892.7 | $ 3,892.7 | 3,669.6 | 3,842.0 | ||
| Accumulated impairment losses | (803.4) | (803.4) | (18.4) | (18.4) | ||
| Goodwill, net | 3,089.3 | 3,089.3 | 3,651.2 | 3,823.6 | 3,823.6 | |
| Impairment loss | 785.0 | |||||
| Bioscience Production | ||||||
| Goodwill [Line Items] | ||||||
| Goodwill, gross | 1,918.0 | 1,918.0 | 1,908.4 | 1,913.5 | ||
| Accumulated impairment losses | (20.4) | (20.4) | (20.4) | (20.4) | ||
| Goodwill, net | $ 1,897.6 | 1,897.6 | $ 1,888.0 | $ 1,893.1 | $ 1,893.1 | |
| Impairment loss | $ 0.0 | |||||
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- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, before accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Includes amount, before amortization expense and impairment loss, of goodwill for private company. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of accumulated impairment loss for asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Indicates line item in statement of income or comprehensive income that includes impairment loss for goodwill. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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