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Goodwill and intangible assets - Carrying Value of Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]        
Beginning balance   $ 287.4 $ 287.1  
Goodwill impairment   (39.1) 0.0 $ 0.0
Translation adjustments   (0.4) 0.3  
Ending balance   247.9 287.4 287.1
DWS        
Goodwill [Roll Forward]        
Beginning balance   140.8 140.5  
Goodwill impairment $ (39.1) (39.1)    
Translation adjustments   (0.4) 0.3  
Ending balance   101.3 140.8 140.5
CA&I        
Goodwill [Roll Forward]        
Beginning balance   38.0 38.0  
Goodwill impairment   0.0    
Translation adjustments   0.0 0.0  
Ending balance   38.0 38.0 38.0
ECS        
Goodwill [Roll Forward]        
Beginning balance   98.3 98.3  
Goodwill impairment   0.0    
Translation adjustments   0.0 0.0  
Ending balance   98.3 98.3 98.3
Other        
Goodwill [Roll Forward]        
Beginning balance   10.3 10.3  
Goodwill impairment   0.0    
Translation adjustments   0.0 0.0  
Ending balance   $ 10.3 $ 10.3 $ 10.3