Segment information - Net Sales by Geographic Regions and Markets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Revenues from External Customers and Long-Lived Assets
Net sales	$ 576.5	$ 809.9	$ 1,286.6	$ 1,614.8
Developed
Revenues from External Customers and Long-Lived Assets
Net sales	372.6	534.1	848.4	1,077.8
Emerging
Revenues from External Customers and Long-Lived Assets
Net sales	203.9	275.8	438.2	537.0
Power Transmission
Revenues from External Customers and Long-Lived Assets
Net sales	370.0	501.5	811.2	1,001.0
Power Transmission | U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	121.5	153.5	259.2	306.4
Power Transmission | North America, excluding U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	23.8	42.5	64.1	84.5
Power Transmission | United Kingdom (“U.K.”)
Revenues from External Customers and Long-Lived Assets
Net sales	6.0	11.8	17.4	23.5
Power Transmission | EMEA, excluding U.K.
Revenues from External Customers and Long-Lived Assets
Net sales	92.6	131.3	221.8	264.6
Power Transmission | East Asia and India
Revenues from External Customers and Long-Lived Assets
Net sales	48.1	73.6	113.3	147.2
Power Transmission | Greater China
Revenues from External Customers and Long-Lived Assets
Net sales	69.3	71.6	113.6	140.5
Power Transmission | South America
Revenues from External Customers and Long-Lived Assets
Net sales	8.7	17.2	21.8	34.3
Fluid Power
Revenues from External Customers and Long-Lived Assets
Net sales	206.5	308.4	475.4	613.8
Fluid Power | U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	112.5	161.8	252.2	318.9
Fluid Power | North America, excluding U.S.
Revenues from External Customers and Long-Lived Assets
Net sales	27.2	47.1	68.9	93.7
Fluid Power | United Kingdom (“U.K.”)
Revenues from External Customers and Long-Lived Assets
Net sales	3.4	9.6	10.3	20.4
Fluid Power | EMEA, excluding U.K.
Revenues from External Customers and Long-Lived Assets
Net sales	31.7	45.8	75.7	93.0
Fluid Power | East Asia and India
Revenues from External Customers and Long-Lived Assets
Net sales	9.7	18.6	27.1	39.1
Fluid Power | Greater China
Revenues from External Customers and Long-Lived Assets
Net sales	17.5	17.2	30.5	32.3
Fluid Power | South America
Revenues from External Customers and Long-Lived Assets
Net sales	$ 4.5	$ 8.3	$ 10.7	$ 16.4