INVESTMENTS - Sum. Finan. Info and Earnings (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments
Revenues		$ 902.8	$ 1,185.4
Operating costs and expenses		743.0	959.4
Net earnings (loss)		159.8	226.0
Recorded equity in earnings	$ 30.6	86.7	(185.2)
Financial Condition:
Current assets	339.3	228.3
Noncurrent assets	843.3	885.3
Total assets	1,182.6	1,113.6
Current liabilities	222.4	160.1
Noncurrent liabilities	260.5	339.8
Total liabilities	482.9	499.9
Stockholders' equity (deficit)	699.7	613.8
Liabilities and stockholders' equity (deficit)	1,182.6	1,113.6
The company's recorded investment	239.1	232.4
NCM
Investments
Revenues	172.2	193.9	426.1
Operating costs and expenses	94.3	171.9	324.2
Net earnings (loss)	77.9	22.0	101.9
Recorded equity in earnings	28.9
Financial Condition:
The company's recorded investment			161.1	$ 323.9
NCM, Inc and NCM, LLC
Investments
Recorded equity in earnings		17.9	(216.3)
DCIP
Investments
Revenues	522.3	176.7	177.4
Operating costs and expenses	489.4	81.9	84.3
Net earnings (loss)	32.9	94.8	93.1
Recorded equity in earnings	25.4	29.1	28.6
Financial Condition:
Current assets	51.4	57.9
Noncurrent assets	568.0	684.3
Total assets	619.4	742.2
Current liabilities	64.6	60.7
Noncurrent liabilities	10.4	132.1
Total liabilities	75.0	192.8
Stockholders' equity (deficit)	544.4	549.5
Liabilities and stockholders' equity (deficit)	619.4	742.2
The company's recorded investment	151.0	152.5
Screenvision
Investments
Recorded equity in earnings	30.1
Other
Investments
Revenues	694.5	532.2	581.9
Operating costs and expenses	583.7	489.2	550.9
Net earnings (loss)	110.8	43.0	31.0
Recorded equity in earnings	5.2	39.7	$ 2.5
Financial Condition:
Current assets	287.9	170.4
Noncurrent assets	275.3	201.0
Total assets	563.2	371.4
Current liabilities	157.8	99.4
Noncurrent liabilities	250.1	207.7
Total liabilities	407.9	307.1
Stockholders' equity (deficit)	155.3	64.3
Liabilities and stockholders' equity (deficit)	563.2	371.4
The company's recorded investment	$ 88.1	$ 79.9

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