CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Income Statement [Abstract]
Net sales	$ 5,845.5	$ 5,208.4
Cost of sales	5,415.5	4,886.9
Selling, general and administrative expenses	176.8	177.3
Amortization of intangible assets	15.9	15.7
Interest expense	24.2	24.9
Other expense, net	13.7	27.3
Consolidated income before provision for income taxes and equity in net income of affiliates	199.4	76.3
Provision for income taxes	45.6	20.4
Equity in net income of affiliates	(9.6)	(10.7)
Consolidated net income	163.4	66.6
Less: Net income attributable to noncontrolling interests	19.8	17.2
Net income attributable to Lear	$ 143.6	$ 49.4
Basic net income per share attributable to Lear (in dollars per share)	$ 2.42	$ 0.82
Diluted net income per share attributable to Lear (in dollars per share)	2.41	0.82
Cash dividends declared per share (in dollars per share)	$ 0.77	$ 0.77
Average common shares outstanding (in shares)	59,316,555	59,932,030
Average diluted shares outstanding (in shares)	59,558,966	60,210,979
Consolidated comprehensive income (Condensed Consolidated Statements of Equity)	$ 264.1	$ 74.0
Less: Comprehensive income attributable to noncontrolling interests	20.2	17.0
Comprehensive income attributable to Lear	$ 243.9	$ 57.0