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OPERATING SEGMENT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 18, 2018	Mar. 15, 2018
Reconciliation of net income to EBITDA
Net earnings (loss)	$ (100.4)	$ 22.2	$ 17.7	$ (42.7)	$ (176.5)	$ 8.4	$ (60.5)	$ (210.8)
Income tax provision (benefit)	11.1			(17.6)			13.2	(136.4)
Interest expense	84.0			71.4			248.9	203.4
Depreciation, Depletion and Amortization	130.2			135.2			398.4	393.9
Certain operating expenses	6.6			3.7			16.2	12.5
Equity in (earnings) loss of non-consolidated entities	(70.0)			1.8			(74.0)	199.1
Cash distributions from non-consolidated entities	3.1			6.5			30.9	33.1
Investment (income) expense	(0.7)			(16.6)			(7.4)	(21.6)
Attributable EBITDA	2.1			0.8			3.7	1.8
Other expense (income)	54.1			(0.6)			57.7	(1.8)
General and Administrative Expense [Abstract]
Merger Acquisition Transaction Costs	18.1			5.6			27.1	57.2
Stock-based compensation expense	4.2			(0.1)			10.9	3.9
Adjusted EBITDA	142.4			147.4			665.1	534.3
Foriegn currency transactions (gain) losses				0.4			(1.1)	3.2
Price per share (in dollars per share)			$ 5.19
Gain (loss) on sale								22.6
Loss on extinguishment of debt								0.5
Attributable EBITDA
Reconciliation of net income to EBITDA
Income tax provision (benefit)	0.1						0.2
Equity in (earnings) loss of non-consolidated entities	(70.0)			1.8			(74.0)	199.1
Equity in earnings (loss) non-theatre JV's	(68.5)			2.1			(72.1)	199.6
Investment (income) expense	(0.1)						(0.3)
Attributable EBITDA	2.1			0.8			3.7	1.8
International markets
General and Administrative Expense [Abstract]
Adjusted EBITDA	37.4			39.8			129.5	113.7
International markets \| Attributable EBITDA
Reconciliation of net income to EBITDA
Depreciation, Depletion and Amortization	0.6			0.5			1.9	1.3
Equity in earnings (loss) International theatre JV's	1.5			0.3			1.9	0.5
NCM
Reconciliation of net income to EBITDA
Equity in (earnings) loss of non-consolidated entities	(28.9)			11.1			(17.3)	216.8
General and Administrative Expense [Abstract]
Impairment of investment							16.0	204.5
Price per share (in dollars per share)			$ 5.19		$ 7.42				$ 7.30	$ 5.64
Gain (loss) on sale	(28.9)		$ (1.1)	(21.0)
Screenvision
Reconciliation of net income to EBITDA
Equity in (earnings) loss of non-consolidated entities	(30.1)			$ (1.0)			$ (30.5)	$ (0.8)
General and Administrative Expense [Abstract]
Gain (loss) on sale	$ 30.1