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Accounts Receivable (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Receivables [Abstract] |  |  |
Authorized amount of receivables sold under RPAs | $ 725,000,000.0 |  |
Accounts receivable sold under RPAs | 2,000,000,000.0 | $ 1,900,000,000 |
Cash proceeds from sale of accounts receivables | 2,000,000,000.0 | 1,900,000,000 |
Fees and financing costs under the RPA | 5,800,000 | $ 4,000,000.0 |
Account receivable sold under the RPAs | $ 479,000,000.0 |  | $ 508,200,000

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- Definition Fees And Interest Paid Under Receivables Purchase Agreements + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Trade Receivable, Authorized Amount For Sale Under Agreement + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Trade Receivable, Cash Payments Under Agreement, Amount + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Trade Receivables, Cash Collected Under Agreement, Amount + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Amount of deductions to trade receivables held-for-sale, after allowance for bad debt, that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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