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Segment information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Depreciation from reportable segments:        
Total depreciation $ 7.3 $ 12.2 $ 16.4 $ 23.9
Other        
Depreciation from reportable segments:        
Total depreciation 2.0 4.0 4.7 7.5
MCM Products | Operating Segments        
Depreciation from reportable segments:        
Total depreciation 4.9 5.6 9.1 11.2
All other segments | Operating Segments        
Depreciation from reportable segments:        
Total depreciation $ 0.4 $ 2.6 $ 2.6 $ 5.2