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Fair value - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, FV-NI, cost $ 3.5  
Long-term debt at fair value 3,469.2 $ 3,793.5
Fair value, nonrecurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 12,614.7 12,878.0
Goodwill 9,051.4 9,022.1
Identifiable intangible assets, net $ 3,559.8 $ 3,855.9