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Contingencies and restrictions (Details 3)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Leverage	1.00	0.91

X

- Definition

This is a measurement of leverage, calculated as a company's interest-bearing liabilities minus cash or cash equivalents.

+ References

No definition available.

+ Details

Name:	sqm_Leverage
Namespace Prefix:	sqm_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration