Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

(In millions, except per share data)

	Thirteen Weeks Ended
	March 31, 2018		June 30, 2018		September 29, 2018		December 31, 2018
Net sales	$	5,733.7	$	5,580.8	$	4,891.6	$	4,942.4
Gross profit	631.4		638.1		526.3		522.5
Consolidated net income	374.2		355.0		274.7		242.8
Net income attributable to Lear	353.7		331.4		252.5		212.2
Basic net income per share attributable to Lear	5.19		4.86		3.83		3.42
Diluted net income per share attributable to Lear	5.16		4.83		3.80		3.39

	Thirteen Weeks Ended
	April 1, 2017		July 1, 2017		September 30, 2017		December 31, 2017
Net sales	$	4,998.5	$	5,123.2	$	4,981.5	$	5,363.8
Gross profit	582.5		577.8		555.9		574.9
Consolidated net income	318.5		327.0		315.0		420.4
Net income attributable to Lear	305.8		311.9		295.2		400.5
Basic net income per share attributable to Lear	4.39		4.53		4.00		5.89
Diluted net income per share attributable to Lear	4.35		4.49		3.96		5.80