Impairment and restructuring charges - Schedule Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.3	$ 6.3	$ (2.1)	$ 22.9
Severance payments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	5.0	(1.3)	19.3
Employee benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.3	1.2	(0.8)	3.3
Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.2	5.0	(1.0)	7.8
Corporate | SG&A
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.1	0.7	(0.5)	9.2
Corporate | R&D
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.0	0.6	(0.6)	5.9
MCM Products | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0.2	4.9	(1.0)	7.5
All other segments | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.0	$ 0.1	$ 0.0	$ 0.3