Basis of Presentation and Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	World Fuel Services Corporation (the “Company”) was incorporated in Florida in July 1984 and along with its consolidated subsidiaries is referred to collectively in this Quarterly Report on Form 10‑Q (“10-Q Report”) as “World Fuel,” “we,” “our” and “us.” We are a leading global fuel services company, principally engaged in the distribution of fuel and related products and services in the aviation, marine and land transportation industries. In recent years, we have expanded our product and service offerings to include energy advisory services and supply fulfillment with respect to natural gas and power and transaction and payment management solutions to commercial and industrial customers. Our intention is to become a leading global energy management company offering a full suite of energy advisory, management and fulfillment services and technology solutions across the energy product spectrum. We also seek to become a leading transaction and payment management company, offering payment management solutions to commercial and industrial customers, principally in the aviation, land and marine transportation industries. We prepared the consolidated financial statements following the requirements of the United States (“U.S.”) Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the U.S. (“U.S. GAAP”) can be condensed or omitted.
Use of Estimates	Certain amounts in the consolidated financial statements and associated notes may not add due to rounding. All percentages have been calculated using unrounded amounts.
Adoption of New Accounting Standard and Accounting Standards Issued but Not Yet Adopted	Adoption of New Accounting Standard Leases (Topic 842). In February 2016, ASU 2016-02 was issued. The primary objective of the new standard, which amends the existing lease guidance and adds additional disclosures, is to increase transparency and comparability among organizations by recognizing nearly all lease assets and lease liabilities on the balance sheet, including operating leases that under the prior standard were off-balance sheet. Topic 842 defines a lease as a contract that conveys the right to control the use of an identified asset for a period of time in exchange for consideration. Control over the use of the identified asset means that the customer has the right to obtain substantially all of the economic benefits from the use of the asset and the right to direct the use of the asset. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 (including interim periods within those periods) and early adoption is permitted. The Company adopted ASU 2016-02 in the first quarter of 2019 utilizing the modified retrospective transition method and applying the transition provisions at the effective date. We implemented the new standard using the package of practical expedients under the transition provisions that allows us not to reassess whether a contract contains a lease, how the lease is classified and if initial direct costs can be capitalized. For all the lessee arrangements, we have elected an accounting policy to combine non-lease components with the related lease components and treat the combined items as a lease for accounting purposes. Lastly, we have elected not to recognize the lease asset and related lease liability for leases with a lease term of 12 months or less. As of the date of implementation on January 1, 2019, the impact of the adoption of the new lease standard resulted in the recognition of the right of use assets of $167.3 million and lease liability of $173.6 million on the Company’s consolidated balance sheet. The difference between the right of use assets and lease liabilities is primarily the result of accrued lease payments and cumulative lease prepayments as well as the remaining balance of lease incentives received. Subsequent to adoption, the Company does not anticipate the impact on its results of operations and cash flows to be material. Accounting Standards Issued but Not Yet Adopted Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. In June 2016, ASU 2016-13 was issued. The amendments in this update will change how entities account for credit impairment from trade and other receivables, net investments arising from sales-type and direct financing leases, debt securities, purchased-credit impaired financial assets and other instruments in addition to loans. ASU 2018-19 issued in November 2018, clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. For receivables and certain other instruments that are not measured at fair value, entities will be required to estimate expected credit losses. Under the expected loss model, an entity recognizes a loss upon initial recognition of the asset that reflects all future events that will lead to a loss being realized, regardless of whether it is probable that the future event will occur. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply most of the amendments in this update using a modified-retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We are currently evaluating the impact that the new standard would have on our consolidated financial statements and disclosures.
Revenue from Contracts with Customers	Our contracts with customers primarily require us to deliver fuel and fuel-related products, while other arrangements require us to complete agreed-upon services. Revenue from the sale of fuel is recognized when our customers obtain control of the fuel, which is typically upon delivery of each promised gallon or barrel to an agreed-upon delivery point. We generally recognize revenue for services provided over the contract period when services have been performed based on our right to invoice for those services. Our contracts may contain fixed or variable pricing (such as market or index-based pricing) or some combination of those. Within our land and aviation segments, contracts with customers may include multi-year sales contracts, which are priced at market-based indices and require minimum volume purchase commitments from our customers. The consideration expected from these contracts is considered variable due to the market-based pricing and the variability is not resolved until delivery is made to our customers. We have elected to apply the optional exemption from estimating and disclosing the variable consideration from our remaining performance obligations under these contracts. We also have fixed price fuel and fuel-related product sale contracts with a contract term of less than one year (typically one month). For these contracts, we apply the optional exemption, to not disclose the amount of transaction price allocated to remaining performance obligations. We also apply this exemption to those contracts in which the right to consideration corresponds directly with the value to the customer of the entity's performance to date. In limited cases, we may have multi-period fixed price contracts. Because our long-term supply arrangements that exceed one year are typically based on market index prices as previously discussed, the transaction price associated with remaining performance obligations under multi-year fixed price fuel sale contracts are not significant.
Leases	We enter into lease arrangements for the use of offices, operational facilities, vehicles, vessels, storage tanks and other assets for our operations around the world. Some of these leases are embedded within other arrangements. When an arrangement includes both lease and non-lease components, we have elected to combine them and treat them as a lease component for all of our current leased asset classes. Determining whether a contract contains a lease includes judgment regarding whether the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. Assessing whether we have obtained the right to substantially all of the economic benefits and the ability to direct how, and for what purpose, the asset is used requires more judgment in storage arrangements where we must determine whether our rights to capacity may represent substantially all of the available capacity at a location. Some of these arrangements are for periods of twelve months or less, while others are for longer periods, and may include optional renewals, terminations or purchase options, which are considered in our assessments when they are reasonably certain to occur. In addition, certain of these arrangements contain payments based on an index, market-based escalation or volume which may impact future payments. Most of our leases typically contain general covenants, restrictions or requirements such as maintaining minimum insurance coverage. We account for our lease-related assets and liabilities based on their classification as operating leases or finance leases, following the relevant accounting guidance. We measure lease related assets and liabilities based on the present value of lease payments, including in-substance fixed payments, variable payments that depend on an index or rate measured at the commencement date, and the amount we believe is probable we will pay the lessor under residual value guarantees when applicable. We discount lease payments based on our estimated incremental borrowing rate at lease commencement (or modification), which is primarily based on our estimated credit rating, the lease term at commencement, and the contract currency of the lease arrangement. We have elected to exclude short term leases (leases with an original lease term less than one year) from the measurement of lease related assets and liabilities.

Basis of Presentation and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2019

World Fuel Services Corporation (the “Company”) was incorporated in Florida in July 1984 and along with its consolidated subsidiaries is referred to collectively in this Quarterly Report on Form 10‑Q (“10-Q Report”) as “World Fuel,” “we,” “our” and “us.”

We are a leading global fuel services company, principally engaged in the distribution of fuel and related products and services in the aviation, marine and land transportation industries. In recent years, we have expanded our product and service offerings to include energy advisory services and supply fulfillment with respect to natural gas and power and transaction and payment management solutions to commercial and industrial customers. Our intention is to become a leading global energy management company offering a full suite of energy advisory, management and fulfillment services and technology solutions across the energy product spectrum. We also seek to become a leading transaction and payment management company, offering payment management solutions to commercial and industrial customers, principally in the aviation, land and marine transportation industries.

We prepared the consolidated financial statements following the requirements of the United States (“U.S.”) Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by accounting principles generally accepted in the U.S. (“U.S. GAAP”) can be condensed or omitted.

Use of Estimates

Certain amounts in the consolidated financial statements and associated notes may not add due to rounding. All percentages have been calculated using unrounded amounts.

Adoption of New Accounting Standard and Accounting Standards Issued but Not Yet Adopted

Adoption of New Accounting Standard

Leases (Topic 842). In February 2016, ASU 2016-02 was issued. The primary objective of the new standard, which amends the existing lease guidance and adds additional disclosures, is to increase transparency and comparability among organizations by recognizing nearly all lease assets and lease liabilities on the balance sheet, including operating leases that under the prior standard were off-balance sheet.

Topic 842 defines a lease as a contract that conveys the right to control the use of an identified asset for a period of time in exchange for consideration. Control over the use of the identified asset means that the customer has the right to obtain substantially all of the economic benefits from the use of the asset and the right to direct the use of the asset.

ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 (including interim periods within those periods) and early adoption is permitted. The Company adopted ASU 2016-02 in the first quarter of 2019 utilizing the modified retrospective transition method and applying the transition provisions at the effective date. We implemented the new standard using the package of practical expedients under the transition provisions that allows us not to reassess whether a contract contains a lease, how the lease is classified and if initial direct costs can be capitalized. For all the lessee arrangements, we have elected an accounting policy to combine non-lease components with the related lease components and treat the combined items as a lease for accounting purposes. Lastly, we have elected not to recognize the lease asset and related lease liability for leases with a lease term of 12 months or less.

As of the date of implementation on January 1, 2019, the impact of the adoption of the new lease standard resulted in the recognition of the right of use assets of $167.3 million and lease liability of $173.6 million on the Company’s consolidated balance sheet. The difference between the right of use assets and lease liabilities is primarily the result of accrued lease payments and cumulative lease prepayments as well as the remaining balance of lease incentives received. Subsequent to adoption, the Company does not anticipate the impact on its results of operations and cash flows to be material.

Accounting Standards Issued but Not Yet Adopted

Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. In June 2016, ASU 2016-13 was issued. The amendments in this update will change how entities account for credit impairment from trade and other receivables, net investments arising from sales-type and direct financing leases, debt securities, purchased-credit impaired financial assets and other instruments in addition to loans. ASU 2018-19 issued in November 2018, clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. For receivables and certain other instruments that are not measured at fair value, entities will be required to estimate expected credit losses. Under the expected loss model, an entity recognizes a loss upon initial recognition of the asset that reflects all future events that will lead to a loss being realized, regardless of whether it is probable that the future event will occur.

The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply most of the amendments in this update using a modified-retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. We are currently evaluating the impact that the new standard would have on our consolidated financial statements and disclosures.

Revenue from Contracts with Customers

Our contracts with customers primarily require us to deliver fuel and fuel-related products, while other arrangements require us to complete agreed-upon services. Revenue from the sale of fuel is recognized when our customers obtain control of the fuel, which is typically upon delivery of each promised gallon or barrel to an agreed-upon delivery point. We generally recognize revenue for services provided over the contract period when services have been performed based on our right to invoice for those services.

Our contracts may contain fixed or variable pricing (such as market or index-based pricing) or some combination of those. Within our land and aviation segments, contracts with customers may include multi-year sales contracts, which are priced at market-based indices and require minimum volume purchase commitments from our customers. The consideration expected from these contracts is considered variable due to the market-based pricing and the variability is not resolved until delivery is made to our customers. We have elected to apply the optional exemption from estimating and disclosing the variable consideration from our remaining performance obligations under these contracts.

We also have fixed price fuel and fuel-related product sale contracts with a contract term of less than one year (typically one month). For these contracts, we apply the optional exemption, to not disclose the amount of transaction price allocated to remaining performance obligations. We also apply this exemption to those contracts in which the right to consideration corresponds directly with the value to the customer of the entity's performance to date. In limited cases, we may have multi-period fixed price contracts. Because our long-term supply arrangements that exceed one year are typically based on market index prices as previously discussed, the transaction price associated with remaining performance obligations under multi-year fixed price fuel sale contracts are not significant.

Leases

We enter into lease arrangements for the use of offices, operational facilities, vehicles, vessels, storage tanks and other assets for our operations around the world. Some of these leases are embedded within other arrangements. When an arrangement includes both lease and non-lease components, we have elected to combine them and treat them as a lease component for all of our current leased asset classes.

Determining whether a contract contains a lease includes judgment regarding whether the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. Assessing whether we have obtained the right to substantially all of the economic benefits and the ability to direct how, and for what purpose, the asset is used requires more judgment in storage arrangements where we must determine whether our rights to capacity may represent substantially all of the available capacity at a location.

Some of these arrangements are for periods of twelve months or less, while others are for longer periods, and may include optional renewals, terminations or purchase options, which are considered in our assessments when they are reasonably certain to occur. In addition, certain of these arrangements contain payments based on an index, market-based escalation or volume which may impact future payments. Most of our leases typically contain general covenants, restrictions or requirements such as maintaining minimum insurance coverage.

We account for our lease-related assets and liabilities based on their classification as operating leases or finance leases, following the relevant accounting guidance. We measure lease related assets and liabilities based on the present value of lease payments, including in-substance fixed payments, variable payments that depend on an index or rate measured at the commencement date, and the amount we believe is probable we will pay the lessor under residual value guarantees when applicable. We discount lease payments based on our estimated incremental borrowing rate at lease commencement (or modification), which is primarily based on our estimated credit rating, the lease term at commencement, and the contract currency of the lease arrangement. We have elected to exclude short term leases (leases with an original lease term less than one year) from the measurement of lease related assets and liabilities.