Payroll, staff and employee benefits obligations - Type of assets (Details) - Pension benefits	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Asset allocation
Equity securities	25.00%	24.00%	26.00%
Debt securities	46.00%	47.00%	43.00%
Monetary	1.00%	1.00%	3.00%
Annuity contracts	20.00%	20.00%	20.00%
Real estate	8.00%	8.00%	8.00%

- 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 percentage that annuity contracts constitute of the fair value of defined benefit plan assets.

+ References

No definition available.

+ Details

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- Definition

The percentage that cash and cash equivalents constitute of the fair value of defined benefit plan assets.

+ References

No definition available.

+ Details

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- Definition

The percentage that instruments representing debt constitute of the fair value of defined benefit plan assets.

+ References

No definition available.

+ Details

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- Definition

The percentage that instruments representing equity constitute of the fair value of defined benefit plan assets.

+ References

No definition available.

+ Details

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- Definition

The percentage that real estate constitutes of the fair value of defined benefit plan assets.

+ References

No definition available.

+ Details

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- Details

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