Restructuring and other strategic initiatives - Restructuring Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Restructuring Cost and Reserve
Restructuring expenses	$ 22.3	$ 0.6	$ 24.2	$ 3.9
Power Transmission
Restructuring Cost and Reserve
Restructuring expenses	19.8	0.3	20.0	3.2
Fluid Power
Restructuring Cost and Reserve
Restructuring expenses	$ 2.5	$ 0.3	$ 4.2	$ 0.7

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration