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Segment information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total gross profit $ 585.9 $ 551.3 $ 529.6
Selling, general and administrative expense (424.2) (450.3) (453.2)
Research and development expense (25.2) (24.1) (24.2)
Goodwill impairment (39.1) 0.0 0.0
Interest expense (31.9) (30.8) (32.4)
Other (expense), net (140.8) (393.9) (82.4)
Loss before income taxes (75.3) (347.8) (62.6)
Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total gross profit 595.7 583.1 582.8
Segment Reconciling Items      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total gross profit $ (9.8) $ (31.8) $ (53.2)