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Cost-reduction actions - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |  |
Cost-reduction charges and other costs | $ 20.6 | $ 9.3 | $ 54.9
Charges (credits) related to work-force reductions | 13.5 | 8.3 | 7.5
Other charges (credits) related to the cost-reduction effort | 7.1 | 1.0 | $ 47.4
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag |  |  | cost-reduction charges and other costs
Employee severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cost-reduction charges and other costs | 23.7 | 15.2 | $ 7.1
Charges (credits) related to work-force reductions | 23.7 | 15.2 | 7.1
Changes in estimates |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Charges (credits) related to work-force reductions | (10.2) | (6.9) | 0.4
Professional fees |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort |  | 4.7 |
Foreign currency (gains) losses related to exiting foreign countries |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort | 2.6 | $ (3.7) | 2.9
Asset held-for-sale |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort |  |  | 13.6
Asset impairments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort | 4.4 |  | 10.9
Facility lease cost |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort |  |  | 11.3
Contract exit costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort |  |  | 9.3
Other expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Other charges (credits) related to the cost-reduction effort | $ 0.1 |  | $ (0.6)

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