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Restructuring charges - Schedule of restructuring reserve (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Restructuring Reserve [Roll Forward]    
Beginning balance $ 3.3 $ 3.7
Costs incurred 1.9 3.2
Cash payments and other (5.0) (3.6)
Ending balance $ 0.2 $ 3.3
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring charges