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Restructuring costs - Schedule of Restructuring Reserve by Type of Cost (Details) - 2023 Restructuring Plan
$ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
Restructuring Reserve [Roll Forward]  
Beginning balance $ 0.0
Accruals 9.7
Cash payments (2.3)
Ending balance 7.4
Employee transition  
Restructuring Reserve [Roll Forward]  
Beginning balance 0.0
Accruals 0.3
Cash payments (0.2)
Ending balance 0.1
Severance payments  
Restructuring Reserve [Roll Forward]  
Beginning balance 0.0
Accruals 8.7
Cash payments (2.0)
Ending balance 6.7
Employee benefits  
Restructuring Reserve [Roll Forward]  
Beginning balance 0.0
Accruals 0.7
Cash payments (0.1)
Ending balance $ 0.6