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Contract assets and deferred revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]    
Contract assets - current $ 16.0 $ 11.7
Contract assets - long-term 6.0 8.6
Deferred revenue - current (210.4) (198.6)
Deferred revenue - long-term (108.8) (104.4)
Revenue recognized that was included in deferred revenue at the beginning of the period $ 189.5 $ 198.9