Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

(In millions, except per share data)

	Thirteen Weeks Ended
	April 4, 2020		July 4, 2020		October 3, 2020		December 31, 2020
Net sales	$	4,457.7	$	2,444.5	$	4,900.1	$	5,243.2
Gross profit	334.2		(127.4)		442.8		459.3
Consolidated net income (loss)	83.6		(269.5)		197.1		222.7
Net income (loss) attributable to Lear	76.4		(293.9)		174.4		201.6
Basic net income (loss) per share attributable to Lear	1.26		(4.89)		2.90		3.35
Diluted net income (loss) per share attributable to Lear	1.26		(4.89)		2.89		3.33

	Thirteen Weeks Ended
	March 30, 2019		June 29, 2019		September 28, 2019		December 31, 2019
Net sales	$	5,160.1	$	5,007.6	$	4,825.0	$	4,817.6
Gross profit	473.2		478.2		459.3		326.8
Consolidated net income	246.1		202.0		238.6		144.0
Net income attributable to Lear	228.9		182.8		215.9		126.0
Basic net income per share attributable to Lear	3.75		2.92		3.59		2.51
Diluted net income per share attributable to Lear	3.73		2.92		3.58		2.50