CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 3,103,085	$ 3,456,938	$ 9,278,017	$ 10,889,575
Cost of revenue	2,996,602	3,324,363	9,019,291	10,614,259
Gross profit	106,483	132,575	258,726	275,316
G&A	(42,371)	(36,697)	(139,439)	(112,853)
Impairment, restructuring and other exit costs	0	0	(26,392)	(106,189)
Foreign currency gain (loss)	37,453	(29,763)	(4,203)	16,197
Operating profit	101,565	66,115	88,692	72,471
Interest expense	(35,579)	(15,650)	(71,521)	(47,908)
Interest income	4,209	3,762	12,266	20,980
Earnings (loss) from Cont Ops before taxes	70,195	54,227	29,437	45,543
Income tax expense (benefit)	26,973	28,516	28,799	(2,406)
Net earnings (loss) from Cont Ops	43,222	25,711	638	47,949
Less: Net earnings (loss) from Cont Ops attributable to NCI	(3,508)	4,193	21,549	19,743
Net earnings (loss) from Cont Ops attributable to Fluor	46,730	21,518	(20,911)	28,206
Net earnings (loss) from Disc Ops attributable to Fluor	(6,261)	(2,177)	(140,090)	(299,814)
Net earnings (loss) attributable to Fluor	40,469	19,341	(161,001)	(271,608)
Less: Dividends on CPS	9,750	0	14,625	0
Net earnings (loss) available to Fluor common stockholders	$ 30,719	$ 19,341	$ (175,626)	$ (271,608)
Basic EPS available to Fluor common stockholders
Net earnings (loss) from Cont Ops (in dollars per share)	$ 0.26	$ 0.15	$ (0.25)	$ 0.20
Net earnings (loss) from Disc Ops, net of taxes (in dollars per share)	(0.04)	(0.01)	(0.99)	(2.13)
Diluted EPS available to Fluor common stockholders
Net earnings (loss) from Cont Ops (in dollars per share)	0.26	0.15	(0.25)	0.20
Net earnings (loss) from Disc Ops (in dollars per share)	$ (0.04)	$ (0.01)	$ (0.99)	$ (2.13)