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Partnerships and Joint Ventures - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($)
Variable interest entity information |  |  |
Asset impairments | $ 298.0 | $ 0.4 | $ 90.4
Number of joint ventures divested | investment |  | 3 |
COOEC Fluor |  |  |
Variable interest entity information |  |  |
Future funding commitments |  | $ 26.0 |
COOEC Fluor |  |  |
Variable interest entity information |  |  |
Asset impairments |  | $ 86.0 | 257.0
Ownership interest (as a percent) |  | 49.00% |
Sacyr Fluor | Discontinued Operations, Disposed of by Sale | Energy & Chemicals |  |  |
Variable interest entity information |  |  |
Ownership interest (as a percent) |  | 50.00% |
Gain (loss) on sale of investments |  | $ (11.0) |
Infrastructure Joint Venture | Discontinued Operations, Disposed of by Sale |  |  |
Variable interest entity information |  |  |
Gain (loss) on sale of investments |  | 8.0 |
Variable Interest Entity, Not Primary Beneficiary | Accounts and notes receivable, net |  |  |
Variable interest entity information |  |  |
Receivables related to work performed |  | $ 218.0 | $ 149.0
Fluor Corporation | Partnership | Majority |  |  |
Variable interest entity information |  |  |
Entity's interest (as a percent) |  | 50.00% |

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