Segment Reporting - Breakdown of Revenue and Gross Margin (Margin Loss) by Category (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
IMAX DMR [Member]
Segment Reporting (Textual) [Abstract]
Marketing costs (recovery)	$ 0.4	$ 4.3	$ 2.8	$ 17.7
Joint Revenue Sharing Arrangements, Contingent Rent [Member]
Segment Reporting (Textual) [Abstract]
Advertising, marketing and commission costs	0.7	0.8	1.3	1.1
IMAX systems [Member]
Segment Reporting (Textual) [Abstract]
Advertising, marketing and commission costs	0.6	0.6	1.0	1.5
Film Distribution [Member]
Segment Reporting (Textual) [Abstract]
Marketing costs (recovery)	0.2	0.1	0.4	0.7
Impairment loss	$ 5.4	$ 0.2	$ 9.9	$ 0.2

Segment reporting.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228

+ Details

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- Definition

Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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- Definition

The aggregate total amount of expenses directly related to the marketing or selling of products or services.

+ References

No definition available.

+ Details

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