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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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