Subsequent events - Public buy-out (Details) - Major business combination [member] - Orange Business Services SA and its subsidiaries [member] - € / shares	Feb. 12, 2020	Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [line items]
Public buy out offer price per share	€ 7.93
Interest rate (as a percent)		93.60%

The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant