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Transactions with related parties (Details 3)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CHF (SFr)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CHF (SFr)
Disclosure of transactions between related parties [line items]            
Key management personnel compensation $ 79.2   $ 72.6   $ 76.3  
Novartis Pension Fund [member]            
Disclosure of transactions between related parties [line items]            
Borrowings credit facility uncommitted         500.0  
Key management personnel of entity or parent [member]            
Disclosure of transactions between related parties [line items]            
Key management personnel compensation $ 69.4   $ 63.9   $ 67.5  
Dr. Alex Krauer [member]            
Disclosure of transactions between related parties [line items]            
Key management personnel compensation | SFr   SFr 60,000   SFr 60,000   SFr 60,000
Dr. Daniel Vasella [member]            
Disclosure of transactions between related parties [line items]            
Key management personnel compensation | SFr           SFr 18,228