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Income taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]      
Gross unrecognized tax benefits, beginning of period $ 6.6 $ 6.8 $ 12.7
Increases (decreases) for tax positions for prior years 0.0 0.4  
Increases (decreases) for tax positions for prior years     (1.5)
Increases for tax positions for current year 0.0 0.1 0.7
Settlements (2.3) 0.0 0.0
Lapse of statute of limitations (2.6) (0.7) (5.1)
Gross unrecognized tax benefits, end of period $ 1.7 $ 6.6 $ 6.8