Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 461.6	$ 233.9	$ 830.7
Other comprehensive income (loss), net of tax:
Defined benefit plan adjustments	77.5	(59.3)	(44.8)
Derivative instruments and hedging activities	(31.2)	2.8	19.5
Foreign currency translation adjustments	(108.3)	139.7	(45.1)
Total other comprehensive income (loss)	(62.0)	83.2	(70.4)
Consolidated comprehensive income	399.6	317.1	760.3
Less: Comprehensive income attributable to noncontrolling interests	90.8	91.0	73.6
Comprehensive income attributable to Lear	$ 308.8	$ 226.1	$ 686.7