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Nature of Business, Acquisitions, Significant Accounting Policies and Recent Accounting Pronouncements - Acquisitions (Details) $ / shares in Units, £ in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
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Jul. 29, 2014 USD ($) location | Mar. 07, 2014 GBP (£) | Mar. 07, 2014 USD ($) | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2015 GBP (£) item | Dec. 31, 2015 USD ($) item $ / shares | Dec. 31, 2014 USD ($) item $ / shares | Dec. 31, 2013 USD ($) item $ / shares | Dec. 31, 2015 USD ($)
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Less: Promissory notes issued |  |  |  |  |  | $ 0.2 | $ 9.0 | $ 3.0 |
Increase (decrease) in goodwill |  |  |  |  |  |  | 0.4 |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 653.3 |  |  | 653.3 | 483.6 | $ 675.8
Liabilities assumed: |  |  |  |  |  |  |  |  |
Escrow payment related to an assumed obligation of an acquired business |  |  |  |  |  |  | 21.7 |  |
Other Investments |  |  |  |  |  |  |  |  |
Proceeds from the sale of crude oil joint venture interests |  |  |  |  |  |  | 43.0 |  |
Gain on sale of crude oil joint venture interests |  |  |  |  |  |  | 18.1 |  |
Gain on sale of crude oil joint venture interest, net of tax and related operating expenses |  |  |  | $ 9.9 |  |  |  |  |
Per share impact on the gain on sale of joint venture interests, net of tax and related operating expenses | $ / shares |  |  |  | $ 0.14 |  |  |  |  |
Other investments |  |  |  | $ 69.5 |  |  | 69.5 |  | 71.1
Extinguishment of Liability |  |  |  |  |  |  |  |  |
Derecognized vendor liability accruals amount |  |  |  |  |  | 8.2 | 5.2 | 8.5 |
Foreign Currency |  |  |  |  |  |  |  |  |
Net foreign currency transaction losses |  |  |  |  |  | 1.9 | 1.0 | 2.8 |
Net foreign currency translation adjustment losses |  |  |  |  |  | (49.6) | (30.9) | (13.2) |
Net foreign currency translation adjustment losses attributable to noncontrolling interest |  |  |  |  |  | 4.0 |  |  |
Cumulative foreign currency translation adjustment losses |  |  |  | (60.2) |  |  | (60.2) | (29.3) | (113.2)
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  |
Foreign Currency |  |  |  |  |  |  |  |  |
Net foreign currency translation adjustment losses attributable to noncontrolling interest |  |  |  |  |  | 4.0 |  |  |
Cumulative foreign currency translation adjustment losses |  |  |  | (60.2) |  |  | (60.2) | (29.3) | (113.8)
Land Segment |  |  |  |  |  |  |  |  |
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Increase (decrease) in goodwill |  |  |  |  |  |  | 0.4 |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 405.9 |  |  | 405.9 | 299.0 | 430.7
Marine segment |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 73.1 |  |  | 73.1 | 69.1 | 71.4
Aviation Segment |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 174.3 |  |  | 174.3 | 115.5 | 173.7
2015 Acquisitions |  |  |  |  |  |  |  |  |
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Estimated purchase price |  |  |  |  |  | 102.3 |  |  |
Less: Cash acquired |  |  |  |  |  | 8.7 |  |  |
Estimated purchase price, net of cash acquired |  |  |  |  |  | 93.6 |  |  |
Less: Amounts due to sellers and promissory notes issued |  |  |  |  |  | 0.5 |  |  |
Cash paid for acquisition of businesses |  |  |  |  |  | $ 93.1 |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  | 8.7
Accounts receivable |  |  |  |  |  |  |  |  | 8.9
Inventories |  |  |  |  |  |  |  |  | 7.4
Property and equipment |  |  |  |  |  |  |  |  | 40.7
Identifiable intangible assets |  |  |  |  |  |  |  |  | 25.9
Goodwill |  |  |  |  |  |  |  |  | 39.4
Other current and long-term assets |  |  |  |  |  |  |  |  | 31.1
Liabilities assumed: |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | (0.5)
Accounts payable |  |  |  |  |  |  |  |  | (10.7)
Customer Deposits |  |  |  |  |  |  |  |  | (1.5)
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  | (38.6)
Other long-term liabilities |  |  |  |  |  |  |  |  | (8.5)
Estimated purchase price |  |  |  |  |  |  |  |  | 102.3
Goodwill anticipated to be deductible for tax purposes |  |  |  |  |  |  |  |  | 1.7
2015 Acquisitions | Trademark/Trade name rights |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  | 0.9
2015 Acquisitions | Customer relationships |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  | 18.1
Liabilities assumed: |  |  |  |  |  |  |  |  |
Weighted average amortizable lives of identifiable intangible assets |  |  |  |  | 5 years 3 months 18 days | 5 years 3 months 18 days |  |  |
2015 Acquisitions | Supplier agreements |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  | 4.8
Liabilities assumed: |  |  |  |  |  |  |  |  |
Weighted average amortizable lives of identifiable intangible assets |  |  |  |  | 6 years 2 months 12 days | 6 years 2 months 12 days |  |  |
2015 Acquisitions | Other |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  | 2.1
Liabilities assumed: |  |  |  |  |  |  |  |  |
Weighted average amortizable lives of identifiable intangible assets |  |  |  |  | 3 years 4 months 24 days | 3 years 4 months 24 days |  |  |
2015 Acquisitions | Land Segment |  |  |  |  |  |  |  |  |
Acquisitions and Significant Accounting Policies |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  | 3 | 3 |  |  |
2015 Acquisitions | Aviation Segment |  |  |  |  |  |  |  |  |
Acquisitions and Significant Accounting Policies |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  | 1 | 1 |  |  |
2015 & 2014 Acquisitions |  |  |  |  |  |  |  |  |
Pro forma results |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | $ 30,952.0 | 44,432.0 |  |
Net income attributable to World Fuel |  |  |  |  |  | $ 190.6 | $ 231.1 |  |
Earnings per common share: |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.71 | $ 3.26 |  |
Diluted (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.70 | $ 3.24 |  |
2014 Acquisitions |  |  |  |  |  |  |  |  |
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Estimated purchase price |  |  |  |  |  |  | $ 295.8 |  |
Less: Cash acquired |  |  |  |  |  |  | 20.2 |  |
Estimated purchase price, net of cash acquired |  |  |  |  |  |  | 275.6 |  |
Less: Promissory notes issued |  |  |  |  |  |  | 9.0 |  |
Less: Amounts due to sellers and promissory notes issued |  |  |  |  |  |  | 3.4 |  |
Cash paid for acquisition of businesses |  |  |  |  |  |  | 263.2 |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 20.2 |  |  | 20.2 |  |
Accounts receivable |  |  |  | 257.9 |  |  | 257.9 |  |
Inventories |  |  |  | 14.4 |  |  | 14.4 |  |
Property and equipment |  |  |  | 55.9 |  |  | 55.9 |  |
Identifiable intangible assets |  |  |  | 83.5 |  |  | 83.5 |  |
Goodwill |  |  |  | 177.8 |  |  | 177.8 |  |
Other current and long-term assets |  |  |  | 22.5 |  |  | 22.5 |  |
Liabilities assumed: |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  | (247.6) |  |  | (247.6) |  |
Accrued expenses and other current liabilities |  |  |  | (50.7) |  |  | (50.7) |  |
Other long-term liabilities |  |  |  | (18.7) |  |  | (18.7) |  |
Initial noncontrolling interest upon acquisition of businesses |  |  |  | (19.4) |  |  | (19.4) |  |
Estimated purchase price |  |  |  | 295.8 |  |  | 295.8 |  |
Goodwill anticipated to be deductible for tax purposes |  |  |  | 22.4 |  |  | 22.4 |  |
Pro forma results |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 44,071.8 | 44,098.8 |
Net income attributable to World Fuel |  |  |  |  |  |  | $ 226.6 | $ 216.4 |
Earnings per common share: |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 3.20 | $ 3.04 |
Diluted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 3.18 | $ 3.01 |
2014 Acquisitions | Trademark/Trade name rights |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 11.5 |  |  | $ 11.5 |  |
2014 Acquisitions | Customer relationships |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | 55.5 |  |  | $ 55.5 |  |
Liabilities assumed: |  |  |  |  |  |  |  |  |
Weighted average amortizable lives of identifiable intangible assets |  |  |  |  |  |  | 4 years 10 months 24 days |  |
2014 Acquisitions | Other |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 16.5 |  |  | $ 16.5 |  |
Liabilities assumed: |  |  |  |  |  |  |  |  |
Weighted average amortizable lives of identifiable intangible assets |  |  |  |  |  |  | 5 years |  |
2014 Acquisitions | Marine segment |  |  |  |  |  |  |  |  |
Acquisitions and Significant Accounting Policies |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  |  |  | 1 |  |
2014 Acquisitions | Aviation Segment |  |  |  |  |  |  |  |  |
Acquisitions and Significant Accounting Policies |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  |  |  | 2 |  |
Watson Petroleum |  |  |  |  |  |  |  |  |
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Estimated purchase price |  |  | $ 164.3 |  |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |  |  |
Escrow payment related to an assumed obligation of an acquired business |  | £ 13.0 | $ 21.7 |  |  |  |  |  |
Amounts due to sellers |  |  |  |  | £ 3.4 |  |  |  | $ 5.1
Additional estimated amounts due to seller |  |  |  |  | £ 2.1 | $ 3.0 |  |  |
Colt |  |  |  |  |  |  |  |  |
Acquisitions and Significant Accounting Policies |  |  |  |  |  |  |  |  |
Number of locations | location | 3,000 |  |  |  |  |  |  |  |
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Estimated purchase price | $ 72.9 |  |  |  |  |  |  |  |
2013 Acquisitions |  |  |  |  |  |  |  |  |
Estimated purchase price of acquisition |  |  |  |  |  |  |  |  |
Estimated purchase price |  |  |  |  |  |  |  | $ 43.8 |
Less: Cash acquired |  |  |  |  |  |  |  | 3.3 |
Estimated purchase price, net of cash acquired |  |  |  |  |  |  |  | 40.5 |
Less: Promissory notes issued |  |  |  |  |  |  |  | 3.0 |
Cash paid for acquisition of businesses |  |  |  |  |  |  |  | 37.5 |
Increase (decrease) in goodwill |  |  |  |  |  |  | $ 0.4 |  |
Decrease in identifiable intangible assets |  |  |  |  |  |  | 0.5 |  |
Amounts paid to sellers |  |  |  |  |  |  | $ 0.1 |  |
Assets acquired: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | 3.3 |
Accounts receivable |  |  |  |  |  |  |  | 31.3 |
Inventories |  |  |  |  |  |  |  | 8.8 |
Property and equipment |  |  |  |  |  |  |  | 3.9 |
Identifiable intangible assets |  |  |  |  |  |  |  | 13.5 |
Goodwill |  |  |  |  |  |  |  | 16.5 |
Other current and long-term assets |  |  |  |  |  |  |  | 2.7 |
Liabilities assumed: |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  |  |  | (29.6) |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  | (3.5) |
Other long-term liabilities |  |  |  |  |  |  |  | (3.1) |
Estimated purchase price |  |  |  |  |  |  |  | $ 43.8 |
2013 Acquisitions | Land Segment |  |  |  |  |  |  |  |  |
Acquisitions and Significant Accounting Policies |  |  |  |  |  |  |  |  |
Number of acquisitions | item |  |  |  |  |  |  |  | 3 |

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