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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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