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Basis of Presentation, New Accounting Standards and Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to World Fuel |  |  | $ 56.5 | $ 48.2 | $ 37.0 | $ 37.2 | $ 29.6 | $ 38.2 | $ 28.7 | $ 31.2 | $ 178.9 | $ 127.7 | $ (170.2) |
Diluted earnings per common share (in dollars per share) |  |  | $ 0.86 | $ 0.73 | $ 0.55 | $ 0.55 | $ 0.44 | $ 0.56 | $ 0.42 | $ 0.46 | $ 2.69 | $ 1.89 | $ (2.50) |
Income from operations |  |  |  |  |  |  |  |  |  |  | $ 299.7 | $ 259.7 | $ 45.6 |
Other investments |  |  | $ 85.1 |  |  |  | $ 73.7 |  |  |  | 85.1 | $ 73.7 |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of use assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 167.3
Lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 173.6
Recognized From Prior Period |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from operations |  | $ 3.4 |  |  |  |  |  |  |  |  |  |  |  |
Income from operations, net of tax |  | 2.3 |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to World Fuel |  |  |  |  |  |  |  |  |  |  | $ 169.9 |  |  |
Diluted earnings per common share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 2.56 |  |  |
Discrete tax benefit, prior year foreign tax return | $ 3.5 | $ 3.2 |  |  |  |  |  |  |  |  | $ 6.6 |  |  |

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