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Contingencies and commitments (Additional Information) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2019
agreement
May 31, 2019
complaints
Apr. 30, 2019
claim
lawsuit
plaintiffs
May 31, 2020
claim
Jun. 04, 2019
claim
May 20, 2019
claim
Loss Contingencies [Line Items]            
Number of claims           1
Novartis Breach Of Contract Action            
Loss Contingencies [Line Items]            
Agreements breached | agreement 2          
Sensipar Antitrust Class Actions            
Loss Contingencies [Line Items]            
Loss contingency, number of plaintiffs | plaintiffs     4      
Loss contingency, number of lawsuits     2      
Loss contingency, number of lawsuits filed | lawsuit     4      
Humira Biosimilar Antitrust Class Actions            
Loss Contingencies [Line Items]            
Number of claims       12 12  
Number of complaints stayed | complaints   6