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Other Comprehensive Income (Loss) - Tax Effects of Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	$ (34,825)	$ 240,627	$ (161,953)
Tax (Expense) Benefit	(1,325)	(78,319)	18,726
Total OCI, net of tax	(36,150)	162,308	(143,227)
Foreign currency translation adjustments
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(17,127)	101,096	(116,775)
Tax (Expense) Benefit	0	(35,596)	16,214
Total OCI, net of tax	(17,127)	65,500	(100,561)
Ownership share of equity method investees' OCI
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(21,837)	(15,630)	12,118
Tax (Expense) Benefit	3,309	3,846	(3,176)
Total OCI, net of tax	(18,528)	(11,784)	8,942
DB plan adjustments
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(19,392)	150,427	(59,920)
Tax (Expense) Benefit	0	(44,975)	7,329
Total OCI, net of tax	(19,392)	105,452	(52,591)
Unrealized gain (loss) on hedges
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	23,531	4,734	1,490
Tax (Expense) Benefit	(4,634)	(1,594)	(1,216)
Total OCI, net of tax	18,897	3,140	274
Unrealized gain (loss) on available-for-sale securities
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	0	0	1,134
Tax (Expense) Benefit	0	0	(425)
Total OCI, net of tax	0	0	709
Less: OCI attributable to NCI
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	883	(1,350)	(2,239)
Tax (Expense) Benefit	0	0	0
Total OCI, net of tax	883	(1,350)	(2,239)
OCI attributable to Fluor Corporation
Tax effects of the components of other comprehensive income (loss)
Before-Tax Amount	(35,708)	241,977	(159,714)
Tax (Expense) Benefit	(1,325)	(78,319)	18,726
Total OCI, net of tax	$ (37,033)	$ 163,658	$ (140,988)