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Subsequent events (Details) - 6 months ended Jun. 30, 2021
€ in Millions, $ in Millions
USD ($)
EUR (€)
Subsequent events    
Payments to Acquire Businesses, Gross $ 46.3  
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Percentage 25.00%  
Definitive Transaction Agreement, Development Milestone, Phase I and II $ 43.7  
Definitive Transaction Agreement, Development Milestone, Phase III | €   € 160.0