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Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2020 USD ($)	Jun. 29, 2019 USD ($)	Jul. 04, 2020 USD ($) segment	Jun. 29, 2019 USD ($)
Segment Reporting Information [Line Items]
Reportable operating segments | segment			2
Restructuring charges			$ 70.2
Seating
Segment Reporting Information [Line Items]
Additional restructuring costs expected to occur	$ 20.0		20.0
E-Systems
Segment Reporting Information [Line Items]
Additional restructuring costs expected to occur	23.0		23.0
Operating segments | Seating
Segment Reporting Information [Line Items]
Restructuring charges	13.4	$ 28.3	25.7	$ 73.5
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Restructuring charges	20.9	8.3	41.2	17.2
Other
Segment Reporting Information [Line Items]
Restructuring charges	0.6	$ 0.1	0.6	$ 0.3
Additional restructuring costs expected to occur	$ 5.0		$ 5.0

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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