Payroll, staff and employee benefits obligations - Type of assets (Details) - Pension benefits	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Asset allocation
Equity securities	26.00%	27.00%	28.00%
Debt securities	43.00%	42.00%	42.00%
Monetary	3.00%	2.00%	4.00%
Annuity contracts	20.00%	21.00%	21.00%
Real estate	8.00%	8.00%	5.00%

- 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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