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Financial Statement Schedule I (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Additional Information - Financial Statement Schedule I
Restricted net assets of the entity's consolidated and unconsolidated subsidiaries not available for distribution	$ 497.2
Threshold percentage of restricted net assets of the entity's consolidated and unconsolidated subsidiaries	25.00%

X

- Definition

Represents the threshold percentage of restricted net assets of the entity's consolidated and unconsolidated subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	csiq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	srt_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant