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Fair value measurements - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investments in equity securities recorded at cost | $ 3.5 | $ 3.5 |
Long-term debt at fair value | 3,494.4 | $ 3,469.2 |
Level 3 | Fair value, nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets | 12,315.1 |  | $ 12,614.7
Goodwill at fair value | 8,927.3 |  | 9,051.4
Net intangible assets at fair value | $ 3,384.3 |  | $ 3,559.8

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