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Goodwill and intangible assets - Additional Information (Details) € in Millions	12 Months Ended
	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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Disclosure of goodwill and indefinite-lived assets.

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Percentage of weighting applied to specific valuation scenarios.

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- Definition

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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