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Value of common units impaired.

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Value of common units surrendered as part of a divestiture.

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The selling expenses incurred on the sale of shares.

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The values of common shares received from an equity method investment.

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INVESTMENTS - Rollforwards (Details) - USD ($)	1 Months Ended								3 Months Ended			9 Months Ended
INVESTMENTS - Rollforwards (Details) - USD ($)	Jul. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Jan. 31, 2018	Oct. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2015	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 18, 2018	Mar. 15, 2018	Jun. 30, 2017	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012
Common Membership Units rollforward
Price per share (in dollars per share)			$ 5.19							$ 5.19
Gain (loss) on sale													$ 22,600,000
Impairment loss										$ 16,000,000
Exhibitor Services Agreement
Changes in carrying amount of investment in NCM and equity in losses of NCM
Balance at the beginning of the period				$ (530,900,000)						(530,900,000)		$ (530,900,000)
ASC 606 revenue recognition change in amortization method												(52,900,000)
Surrender of common units for transferred theatres												5,200,000
Amortization of ESA												10,900,000
Balance at the end of the period									$ (567,700,000)			(567,700,000)
Common Membership Units rollforward
Surrender of common units for transferred theatres												$ 5,200,000
Term of amortization of the exhibitor services agreement (ESA) with NCM												30 years
Other Comprehensive (Income)
Changes in carrying amount of investment in NCM and equity in losses of NCM
Balance at the beginning of the period				(1,800,000)						(1,800,000)		$ (1,800,000)
Equity in earnings												100,000
Sale of common units												1,700,000
Cash Received (Paid)
Changes in carrying amount of investment in NCM and equity in losses of NCM
Receipt of excess cash distributions												15,300,000
Sale of common units												156,800,000
Expenses on sale of shares												1,400,000
Balance at the end of the period									173,500,000			173,500,000
Equity in (Earnings)/Loss
Changes in carrying amount of investment in NCM and equity in losses of NCM
Surrender of common units for transferred theatres												1,100,000
Other-than-temporary impairment loss - held for sale												14,400,000
Equity in earnings												(3,300,000)
Sale of common units												(30,200,000)
Expenses on sale of shares												1,400,000
Balance at the end of the period									(16,600,000)			(16,600,000)
Common Membership Units rollforward
Surrender of common units for transferred theatres												1,100,000
Advertising (Revenue)
Changes in carrying amount of investment in NCM and equity in losses of NCM
Amortization of ESA												(10,900,000)
Balance at the end of the period									(10,900,000)			(10,900,000)
NCM, Inc.
Changes in carrying amount of investment in NCM and equity in losses of NCM
Balance at the beginning of the period				6,800,000						6,800,000		6,800,000
Other-than-temporary impairment loss - held for sale												(1,600,000)
Net proceeds from the sale of common shares												(4,900,000)
Dividends received NCM, Inc. common shares												$ (300,000)
Common Membership Units rollforward
Number of units sold												1,000,000
Impairment loss										1,600,000
NCM, Inc. \| Cash Received (Paid)
Changes in carrying amount of investment in NCM and equity in losses of NCM
Net proceeds from the sale of common shares												$ 7,200,000
Expenses on sale of shares				(100,000)
Dividends received NCM, Inc. common shares												300,000
Balance at the end of the period									7,400,000			7,400,000
NCM, Inc. \| Equity in (Earnings)/Loss
Changes in carrying amount of investment in NCM and equity in losses of NCM
Other-than-temporary impairment loss - held for sale												1,600,000
Net proceeds from the sale of common shares												(2,300,000)
Expenses on sale of shares				100,000
Balance at the end of the period									(600,000)			(600,000)
NCM, Inc. \| Common Stock
Common Membership Units rollforward
Units exchanged for NCM, Inc. shares								200,000
Number of units converted					1,000,000	14,600,000
Number of units sold		(1,000,000)				(14,800,000)
NCM
Changes in carrying amount of investment in NCM and equity in losses of NCM
Balance at the beginning of the period				$ 161,100,000						$ 161,100,000		161,100,000
Surrender of common units for transferred theatres												(6,300,000)
Receipt of excess cash distributions												(15,300,000)
Other-than-temporary impairment loss - held for sale												(14,400,000)
Equity in earnings												3,200,000
Sale of common units												(128,300,000)
Common Membership Units rollforward
Surrender of common units for transferred theatres												$ (6,300,000)
Price per share (in dollars per share)			$ 5.19							$ 5.19				$ 7.30	$ 5.64	$ 7.42
Gain (loss) on sale									$ (28,900,000)	$ (1,100,000)	$ (21,000,000)
Term of amortization of the exhibitor services agreement (ESA) with NCM												30 years
Impairment loss										$ 14,400,000
NCM \| Common Stock
Common Membership Units rollforward
Number of units converted						(14,600,000)
NCM \| Member Units Tranche 1 [Member]
Common Membership Units rollforward
Number of units owned (in shares)																				17,323,782
Number of units sold	(17,323,782)
NCM \| Member Units Tranche 2 [Member]
Changes in carrying amount of investment in NCM and equity in losses of NCM
Surrender of common units for transferred theatres			$ (915,150)				$ (2,850,453)
Common Membership Units rollforward
Membership units received in ESA (in shares)						18,787,315		4,399,324			18,787,315		18,787,315				469,163	141,731	1,728,988
Units exchanged for NCM, Inc. shares								(200,000)
Surrender of common units for transferred theatres			$ (915,150)				$ (2,850,453)
Number of units converted					(1,000,000)
Number of units sold	(4,153,698)
Price per share (in dollars per share)			$ 5.64				$ 12.52	$ 15.75		$ 5.64							$ 14.52	$ 15.08	$ 15.22
NCM \| Member Units Tranche 2 [Member] \| Exhibitor Services Agreement
Common Membership Units rollforward
Surrender of units for exclusivity waiver							(1,807,220)