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Fair value measurements - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 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 3,479.6 3,469.2
Level 3 | Fair value, nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 12,570.1 12,614.7
Goodwill at fair value 9,065.3 9,051.4
Net intangible assets at fair value $ 3,501.3 $ 3,559.8