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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)

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