Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 19,263.1	$ 17,045.5	$ 19,810.3
Cost of sales	17,871.2	15,936.6	18,072.8
Selling, general and administrative expenses	643.2	588.9	605.0
Amortization of intangible assets	73.3	65.9	62.3
Interest expense	91.8	99.6	92.0
Other expense, net	0.1	55.2	24.6
Consolidated income before provision for income taxes and equity in net income of affiliates	583.5	299.3	953.6
Provision for income taxes	137.7	93.9	146.1
Equity in net income of affiliates	(15.8)	(28.5)	(23.2)
Consolidated net income	461.6	233.9	830.7
Less: Net income attributable to noncontrolling interests	87.7	75.4	77.1
Net income attributable to Lear	$ 373.9	$ 158.5	$ 753.6
Basic net income per share available to Lear common stockholders (in dollars per share)	$ 6.22	$ 2.63	$ 12.80
Diluted net income per share available to Lear common stockholders (in dollars per share)	$ 6.19	$ 2.62	$ 12.75
Average common shares outstanding (in shares)	60,082,833	60,254,380	61,697,192
Average diluted shares outstanding (in shares)	60,420,484	60,429,962	61,923,528