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Fair value measurements (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Increase (Decrease) in Equity Securities, FV-NI $ 3.5 $ 3.2
Carrying value of long-term investments in equity 26.9 $ 22.6
Fair value, nonrecurring | Fair value, inputs, level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets at fair value 13,478.7  
Goodwill at fair value 8,970.3  
Net intangible assets at fair value $ 4,508.5