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Goodwill and intangible assets - Additional Information (Details) € in Millions | 12 Months Ended
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Dec. 31, 2020 EUR (€) segment | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€)
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items] |  |  |
Number of operating segments | segment | 2 |  |
Percentage of weightings | 50.00% |  |
Discount rate |  |  | 13.00%
Revenue multiple used to estimate enterprise value |  |  | 3.0
Research and Development |  |  |
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items] |  |  |
Amortization expense | € | € 18 | € 14 | € 11
Income Approach | Premium |  |  |
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items] |  |  |
Discount rate | 8.00% |  |
Income Approach | Ad-Supported |  |  |
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items] |  |  |
Discount rate | 8.50% |  |
Market Approach | Bottom of Range |  |  |
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items] |  |  |
Revenue multiple used to estimate enterprise value | 4.0 |  |
Market Approach | Top of Range |  |  |
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items] |  |  |
Revenue multiple used to estimate enterprise value | 6.5 |  |

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