Leases - Guaranteed (Details) $ in Millions	Sep. 30, 2019 USD ($)
Refinitiv \| US lease secured by letter of credit
Guarantor Obligations [Line Items]
Letter of credit guaranteed by Refinitiv	$ 1.2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_GuaranteeObligationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration