Employee Benefit Plans - Net periodic benefit cost (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 29, 2024	Dec. 31, 2024	Dec. 31, 2023
Employee Benefit Plans
Interest costs on benefit obligation		$ 1.9	$ 0.7
Expected return on plan assets		(2.0)	$ (0.7)
Settlement gain	$ (7.8)	(7.8)
Net periodic benefit income		$ (7.9)