Segment information - Sales and Adjusted EBITDA by Reporting Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Segment Reporting Information
Net sales	$ 881.3	$ 710.1
Adjusted EBITDA	196.3	120.8
Power Transmission
Segment Reporting Information
Net sales	559.5	441.2
Adjusted EBITDA	132.7	79.5
Fluid Power
Segment Reporting Information
Net sales	321.8	268.9
Adjusted EBITDA	$ 63.6	$ 41.3