XML 69 R49.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table summarizes the changes in accumulated other comprehensive (loss) income for the year ended September 30, 2018.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  | Accumulated Other Comprehensive Loss
Balances as of September 30, 2017 |  | $ | (21.5 | ) |  | $ | (3.0 | ) |  | $ | (24.5 | )
Other comprehensive (loss) income, net of tax before reclassifications |  | (9.0 | ) |  | 0.3 |  |  | (8.7 | )
Amounts reclassified from AOCI, net of tax |  | — |  |  | 0.1 |  |  | 0.1 |
Other comprehensive (loss) income, net of tax |  | (9.0 | ) |  | 0.4 |  |  | (8.6 | )
Balances as of September 30, 2018 |  | $ | (30.5 | ) |  | $ | (2.6 | ) |  | $ | (33.1 | )

X
- Definition Accumulated Other Comprehensive Income (Loss) [Abstract] + References No definition available. + Details
Name: | intl_AccumulatedOtherComprehensiveIncomeLossAbstract
Namespace Prefix: | intl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration