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Cost-reduction actions - Liabilities and Expected Future Payments Related to Work-Force Reduction Actions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restructuring Reserve [Roll Forward]      
Additional provisions $ 20.6 $ 9.3 $ 54.9
Work-Force Reductions      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 9.4 11.7 16.3
Additional provisions 23.7 15.2 7.1
Payments (9.6) (10.8) (11.5)
Changes in estimates (10.2) (6.9) 0.4
Translation adjustments (0.3) 0.2 (0.6)
Balance at end of period 13.0 9.4 11.7
Expected future payments on balance at December 31, 2024:      
In 2025 13.0    
Work-Force Reductions | U.S.      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 2.5 4.2 5.7
Additional provisions 7.5 3.4 3.6
Payments (2.5) (3.5) (4.1)
Changes in estimates (3.1) (1.6) (1.0)
Translation adjustments 0.0 0.0 0.0
Balance at end of period 4.4 2.5 4.2
Expected future payments on balance at December 31, 2024:      
In 2025 4.4    
Work-Force Reductions | International      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 6.9 7.5 10.6
Additional provisions 16.2 11.8 3.5
Payments (7.1) (7.3) (7.4)
Changes in estimates (7.1) (5.3) 1.4
Translation adjustments (0.3) 0.2 (0.6)
Balance at end of period 8.6 $ 6.9 $ 7.5
Expected future payments on balance at December 31, 2024:      
In 2025 $ 8.6