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Guarantees and Contingencies - Additional Information (Details) - USD ($) $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 11, 2018 | Oct. 01, 2017 | Jul. 17, 2015 | Mar. 31, 2018 | Jun. 30, 2018
GXS Group, Inc. |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  |  |  |  | $ 1.6
GXS Group, Inc. | Municipality of Sao Paulo |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Payments for legal settlements |  | $ 1.4 |  |  |
GXS India |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  |  |  |  | 1.3
Internal Revenue Service (IRS) |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimated amount of loss resulting from an adverse tax position |  |  |  | $ 605.0 | 725.0
Income tax examination, tax |  |  |  |  | 455.0
Income tax examination, penalties |  |  |  |  | 105.0
Income tax examination, interest |  |  |  |  | 165.0
Internal Revenue Service (IRS) | Subsequent Event |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Income tax examination, change in liability | $ 120.0 |  |  |  |
Internal Revenue Service (IRS) | Tax Year 2010 |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimated amount of loss resulting from an adverse tax position |  |  | $ 280.0 |  |
Internal Revenue Service (IRS) | Tax Year 2010 | Subsequent Event |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimated amount of loss resulting from an adverse tax position | 335.0 |  |  |  |
Income tax examination, tax | 95.0 |  |  |  |
Income tax examination, interest | 5.0 |  |  |  |
Income tax examination, change in liability | 55.0 |  |  |  |
Income tax examination, penalties and interest | $ 20.0 |  |  |  |
Additional tax expense, as a percent | 20.00% |  |  |  |
Internal Revenue Service (IRS) | Tax Year 2012 | Subsequent Event |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Income tax examination, change in liability | $ 80.0 |  |  |  |
Additional tax expense, as a percent | 40.00% |  |  |  |
Canada Revenue Agency (CRA) |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimated amount of loss resulting from an adverse tax position |  |  |  |  | $ 23.0
Canada Revenue Agency (CRA) | Tax Year 2012 |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Additional tax expense, as a percent |  |  |  |  | 10.00%
Income tax examination, estimate of increase to taxable income |  |  |  |  | $ 90.0
Canada Revenue Agency (CRA) | Tax Year 2013 |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Income tax examination, estimate of increase to taxable income |  |  |  |  | $ 90.0

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