Segment information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Depreciation from reportable segments:
Total depreciation	$ 7.0	$ 9.1
Other
Depreciation from reportable segments:
Total depreciation	1.9	2.7
MCM Products | Operating Segments
Depreciation from reportable segments:
Total depreciation	4.6	4.2
All other segment | Operating Segments
Depreciation from reportable segments:
Total depreciation	$ 0.5	$ 2.2