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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 1,380.9	$ 1,040.5	$ 795.8
Other comprehensive income (loss), net of tax:
Defined benefit plan adjustments	8.8	1.8	24.6
Derivative instruments and hedging activities	22.2	(6.4)	(5.5)
Foreign currency translation adjustments	305.0	(109.5)	(251.1)
Total other comprehensive income (loss)	336.0	(114.1)	(232.0)
Consolidated comprehensive income	1,716.9	926.4	563.8
Less: Comprehensive income attributable to noncontrolling interests	81.3	56.8	46.4
Comprehensive income attributable to Lear	$ 1,635.6	$ 869.6	$ 517.4

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