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Subsequent events (Details) - Feb. 23, 2021 - Potential ordinary share transactions [member] $ in Millions	SFr / shares	USD ($)
Disclosure of non-adjusting events after reporting period [line items]
Dividends declared (per share) | SFr / shares	SFr 0.10
Dividends declared, amount | $		$ 56
Dividends declared (per share) | SFr / shares	SFr 0.10
Dividends declared, amount | $		$ 56

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

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