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Commitments and Contingencies - Deferred Compensation, Environmental and Other Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items] |  |
Employer match for each 1% of the participants contributions up to 6% of the participants contributions (as a percent) | 50.00% |
Percentage of eligible compensation up to 6% of the eligible compensation, matched 50% by employer | 1.00% |
Employer contribution limit per calendar year (as a percent of compensation) | 6.00% |
Other long-term liabilities |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Deferred compensation payable | $ 14.0 | $ 16.7

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- Definition The limit of annual employer contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
Name: | int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation
Namespace Prefix: | int_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |