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Quarterly Financial Data (unaudited) - Summary of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 4,942.4	$ 4,891.6	$ 5,580.8	$ 5,733.7	$ 5,363.8	$ 4,981.5	$ 5,123.2	$ 4,998.5	$ 21,148.5	$ 20,467.0	$ 18,557.6
Gross profit	522.5	526.3	638.1	631.4	574.9	555.9	577.8	582.5
Consolidated net income	242.8	274.7	355.0	374.2	420.4	315.0	327.0	318.5	1,246.7	1,380.9	1,040.5
Net income attributable to Lear	$ 212.2	$ 252.5	$ 331.4	$ 353.7	$ 400.5	$ 295.2	$ 311.9	$ 305.8	$ 1,149.8	$ 1,313.4	$ 975.1
Basic net income per share attributable to Lear (in dollars per share)	$ 3.42	$ 3.83	$ 4.86	$ 5.19	$ 5.89	$ 4.00	$ 4.53	$ 4.39	$ 17.35	$ 18.79	$ 13.48
Diluted net income per share attributable to Lear (in dollars per share)	$ 3.39	$ 3.80	$ 4.83	$ 5.16	$ 5.80	$ 3.96	$ 4.49	$ 4.35	$ 17.22	$ 18.59	$ 13.33

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