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Restructuring and impairment costs - Schedule of Restructuring Reserve by Type of Cost (Details) - January 2023 Restructuring Plan - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Restructuring Reserve [Roll Forward]      
Beginning balance $ 7.4 $ 0.0 $ 0.0
Accruals (0.1) 9.7 9.6
Cash payments (3.7) (2.3)  
Ending balance 3.6 7.4 3.6
Employee transition      
Restructuring Reserve [Roll Forward]      
Beginning balance 0.1 0.0 0.0
Accruals 0.0 0.3 0.3
Cash payments 0.0 (0.2)  
Ending balance 0.1 0.1 0.1
Severance payments      
Restructuring Reserve [Roll Forward]      
Beginning balance 6.7 0.0 0.0
Accruals 0.1 8.7 8.8
Cash payments (3.6) (2.0)  
Ending balance 3.2 6.7 3.2
Employee benefits      
Restructuring Reserve [Roll Forward]      
Beginning balance 0.6 0.0 0.0
Accruals (0.2) 0.7 0.5
Cash payments (0.1) (0.1)  
Ending balance $ 0.3 $ 0.6 $ 0.3