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Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Alacer Acquisition
Business combination, cash and equivalents and restricted cash	$ 303.4

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents and Restricted Cash

+ References

No definition available.

+ Details

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Namespace Prefix:	ssrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_BusinessAcquisitionAxis=ssrm_AlacerAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: