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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (366,791)	$ (1,553,122)	$ 232,853
OCI, net of tax:
Foreign currency translation adjustment	(17,127)	65,500	(100,561)
Ownership share of equity method investees' OCI	(18,528)	(11,784)	8,942
Defined benefit plan adjustments	(19,392)	105,452	(52,591)
Unrealized gain (loss) on hedges	18,897	3,140	274
Unrealized gain (loss) on available-for-sale securities	0	0	709
Total OCI, net of tax	(36,150)	162,308	(143,227)
Comprehensive income (loss)	(402,941)	(1,390,814)	89,626
Less: Comprehensive income (loss) attributable to NCI	69,138	(32,310)	57,145
Comprehensive income (loss) attributable to Fluor Corporation	$ (472,079)	$ (1,358,504)	$ 32,481

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