GOODWILL (Details) $ in Millions	6 Months Ended
Jun. 30, 2021 USD ($) segment
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 2,547.3
Currency translation adjustment	(33.9)
Balance at the end of the period	$ 2,472.1
Number of reporting units \| segment	2
Domestic theatres
Goodwill [Roll Forward]
Balance at the beginning of the period	$ 1,796.5
Balance at the end of the period	1,796.5
International theatres
Goodwill [Roll Forward]
Balance at the beginning of the period	750.8
Currency translation adjustment	(33.9)
Balance at the end of the period	675.6
Forum Cinemas OU \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Estonia
Goodwill [Roll Forward]
Baltics disposition	(3.7)
Forum Cinemas OU \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Estonia \| International theatres
Goodwill [Roll Forward]
Baltics disposition	(3.7)
Forum Cinemas OU \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Lithuania
Goodwill [Roll Forward]
Baltics disposition	(37.6)
Forum Cinemas OU \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Lithuania \| International theatres
Goodwill [Roll Forward]
Baltics disposition	$ (37.6)

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Section 50
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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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