Goodwill and intangible assets - Additional Information (Details) € in Millions	12 Months Ended
	Dec. 31, 2024 EUR (€) segment	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€)
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Number of operating segments \| segment	2
Income Approach \| Ad-Supported
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Percentage of weightings	80.00%
Discount rate	11.00%
Income Approach \| Premium
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Percentage of weightings	50.00%
Discount rate	10.00%
Venture Capital Method \| Ad-Supported
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Percentage of weightings	20.00%
Market Approach \| Ad-Supported
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Revenue multiple used to estimate enterprise value	3.7
Market Approach \| Premium
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Percentage of weightings	50.00%
Market Approach \| Premium \| Bottom of Range
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Revenue multiple used to estimate enterprise value	4.9
Market Approach \| Premium \| Top of Range
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Revenue multiple used to estimate enterprise value	4.1
Research and development
Disclosure Of Goodwill And Indefinite Lived Assets [Line Items]
Amortization expense \| €	€ 30	€ 35	€ 40