Segment information - Net Sales by Geographic Regions and Markets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Revenues from External Customers and Long-Lived Assets
Net sales	$ 710.1	$ 804.9
Developed
Revenues from External Customers and Long-Lived Assets
Net sales	475.8	543.7
Emerging
Revenues from External Customers and Long-Lived Assets
Net sales	234.3	261.2
Power Transmission
Revenues from External Customers and Long-Lived Assets
Net sales	441.2	499.5
Power Transmission | U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	137.7	152.9
Power Transmission | North America, excluding U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	40.3	42.0
Power Transmission | United Kingdom (“U.K.”)
Revenues from External Customers and Long-Lived Assets
Net sales	11.4	11.7
Power Transmission | EMEA, excluding U.K.
Revenues from External Customers and Long-Lived Assets
Net sales	129.2	133.3
Power Transmission | East Asia and India
Revenues from External Customers and Long-Lived Assets
Net sales	65.2	73.6
Power Transmission | Greater China
Revenues from External Customers and Long-Lived Assets
Net sales	44.3	68.9
Power Transmission | South America
Revenues from External Customers and Long-Lived Assets
Net sales	13.1	17.1
Fluid Power
Revenues from External Customers and Long-Lived Assets
Net sales	268.9	305.4
Fluid Power | U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	139.7	157.1
Fluid Power | North America, excluding U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	41.7	46.6
Fluid Power | United Kingdom (“U.K.”)
Revenues from External Customers and Long-Lived Assets
Net sales	6.9	10.8
Fluid Power | EMEA, excluding U.K.
Revenues from External Customers and Long-Lived Assets
Net sales	44.0	47.2
Fluid Power | East Asia and India
Revenues from External Customers and Long-Lived Assets
Net sales	17.4	20.5
Fluid Power | Greater China
Revenues from External Customers and Long-Lived Assets
Net sales	13.0	15.1
Fluid Power | South America
Revenues from External Customers and Long-Lived Assets
Net sales	$ 6.2	$ 8.1