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Income taxes - Liability for Unrecognized Tax Benefits and Deferred Tax Position Recorded on Consolidated Balance Sheets (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Liability for unrecognized tax benefits € (253.1) € (249.7) € (215.5)
Deferred tax assets 1,940.7 1,872.3 1,672.8
Deferred tax liabilities (46.1) (122.6) (51.5)
Deferred and other tax assets (liabilities) € 1,641.5 € 1,500.0 € 1,405.8