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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Price of a single share of a number of saleable stocks of a company.

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INVESTMENTS - Agreements (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended			9 Months Ended
	Mar. 15, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 18, 2018	Jun. 30, 2017	Mar. 16, 2017
Investments
Price per share (in dollars per share)		$ 5.19			$ 5.19
Impairment loss					$ 16.0
NCM, Inc.
Investments
Impairment loss					$ 1.6
NCM
Investments
Common units returned under Common Unit Adjustment Agreement		915,150
Value of common units returned under Unit Adjustment agreement	5,200,000	6,300,000
Loss on NCM transactions		$ 1.1		$ (28.9)			$ (30.0)	$ 22.2
Price per share (in dollars per share)	$ 5.64	$ 5.19			$ 5.19				$ 7.30	$ 7.42
Number of shares sold				21,477,480
Impairment loss					$ 14.4
Theatres Divested as Required by US DOJ \| NCM
Investments
Total common units received			361,892
Common units returned under Common Unit Adjustment Agreement			2,850,453
Value of common units returned under Unit Adjustment agreement			36,400,000
Common units returned under waiver of exclusivity agreement			1,807,220
Value of common units returned under waiver of exclusivity agreement			$ 22.6
Loss on NCM transactions			$ 1.2
Net common units received			14,129,642
Value of net common units received							$ 176.9
Price per share (in dollars per share)											$ 12.52
Number of shares sold						14,800,000	21,477,480
Carmike \| Theatres Divested as Required by US DOJ \| NCM
Investments
Total common units received			18,425,423