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Summary of significant accounting policies (Details) - USD ($)
$ in Millions
May 15, 2023
Jun. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Long-term debt   $ 909.3 $ 1,413.8
Line of Credit      
Debt Instrument [Line Items]      
Long-term debt   250.2 598.0
Revolving Credit Facility | Term Loan      
Debt Instrument [Line Items]      
Long-term debt   $ 206.1 $ 362.8
Senior secured credit agreement - Term loan due 2025 | Amended Credit Agreement      
Debt Instrument [Line Items]      
Debt instrument, covenant, consideration threshold $ 75.0