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Fair value measurement (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of other equity investments $ 2.5    
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of other equity investments $ 2.5    
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of total long-term debt   $ 3,000.0 $ 3,400.0