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Goodwill and intangible assets - Intangible asset assumptions (Details)	Dec. 31, 2019
Surgical [member]
Disclosure of detailed information about intangible assets [line items]
Growth rate used to extrapolate cash flow projections	3.00%
Discount rate (post-tax)	7.50%
Vision Care [member]
Disclosure of detailed information about intangible assets [line items]
Growth rate used to extrapolate cash flow projections	3.00%
Discount rate (post-tax)	7.00%

X

- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

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- Definition

The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

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

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