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Restructuring charges - Restructuring Reserve (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Restructuring Reserve [Roll Forward]    
Beginning balance $ 11.7 $ 9.0
Costs incurred 1.9 6.2
Cash payments and other (9.9) (3.5)
Ending balance $ 3.7 $ 11.7
Restructuring, Incurred Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring charges