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Accounts Receivable (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Receivables [Abstract] |  |
Authorized amount of receivables sold under RPAs | $ 725,000,000.0 |
Accounts receivable sold under RPAs | 6,100,000,000 | $ 4,600,000,000
Amount collected of accounts receivables under repurchase agreement | 6,000,000,000.0 | 4,500,000,000
Fees and financing costs under the RPA | 14,200,000 | 8,700,000
Account receivable sold | $ 553,700,000 | $ 377,300,000

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- Definition Fees And Interest Paid Under Receivables Purchase Agreements + References No definition available. + Details
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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
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- Definition Trade Receivable, Sold Under Agreement, Amount + References No definition available. + Details
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Namespace Prefix: | int_
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Balance Type: | credit
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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
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- References No definition available. + Details
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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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