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Transactions with related parties (Details 3) $ in Millions | 12 Months Ended
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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

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