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Consolidated Statements of Shareholders' Equity (Parenthetical) | 12 Months Ended
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Dec. 31, 2019
Statement of Stockholders' Equity [Abstract] |
Remaining equity interest acquired, percent | 49.00%

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- Definition Noncontrolling Interest, Ownership Percentage By Parent, Remaining Interest Acquired + References No definition available. + Details
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Namespace Prefix: | int_
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Balance Type: | na
Period Type: | duration

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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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