Events After the Reporting Period - Additional Information (Details) - EUR (€) € in Millions |
1 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Feb. 08, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Feb. 12, 2019 |
|
| Disclosure Of Nonadjusting Events After Reporting Period [Line Items] | |||||
| Repurchases of ordinary shares, Shares | 6,427,271 | 0 | 0 | ||
| Repurchases of ordinary shares | € 77 | ||||
| Major Ordinary Share Transactions | |||||
| Disclosure Of Nonadjusting Events After Reporting Period [Line Items] | |||||
| Repurchases of ordinary shares, Shares | 548,121 | ||||
| Repurchases of ordinary shares | € 62 | ||||
| Major business combination | Gimlet Media Inc. and Anchor FM Inc | |||||
| Disclosure Of Nonadjusting Events After Reporting Period [Line Items] | |||||
| Total purchase consideration | € 300 | ||||