STOCKHOLDERS' DEFICIT - Dividends (Narrative) (Details) $ in Millions								3 Months Ended
	Jan. 24, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 05, 2017 USD ($)	Feb. 23, 2017 USD ($)	Feb. 09, 2017 USD ($)	Feb. 04, 2016 USD ($)	Jan. 07, 2016 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($) market	Jan. 21, 2016 USD ($)	Dec. 20, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds received through subsidiaries		$ 22.4	$ 22.4
Percentage of dividend received		89.50%	89.50%
CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payment of dividend		$ 25.0	$ 25.0		$ 282.5
CCOH | Special cash dividend
Accumulated Other Comprehensive Income (Loss) [Line Items]
Special cash dividend declared										$ 540.0	$ 217.8
Parent Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds received through subsidiaries				$ 254.0
Outstanding amount demanded for repayment						$ 300.0				$ 300.0
Percentage of dividend received				89.90%
The Company | Parent Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds received through subsidiaries						486.5
Dividend proceeds net of repayment of the Note						186.5
The Company | Parent Company | Special cash dividend
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds received through subsidiaries							$ 196.3
Noncontrolling Interests | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds received through subsidiaries						$ 53.5
Non-strategic outdoor markets
Accumulated Other Comprehensive Income (Loss) [Line Items]
Number of markets sold | market									9
Non-strategic outdoor markets | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Number of markets sold | market									9
Aggregate purchase price in cash and certain advertising assets									$ 592.3
Australia Outdoor | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Aggregate purchase price in cash and certain advertising assets								$ 195.7
Public Stockholders | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payment of dividend		$ 2.6	$ 2.6	$ 28.5
Payment of dividend, percentage paid		10.50%	10.50%	10.10%
Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Proceeds received through subsidiaries	$ 26.8
Percentage of dividend received	89.50%
Subsequent Event | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payment of dividend	$ 30.0
Subsequent Event | Public Stockholders | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Payment of dividend	$ 3.2
Payment of dividend, percentage paid	10.50%
Majority Shareholder
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of demand for repayment			$ 25.0
Majority Shareholder | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of demand for repayment		$ 25.0
Majority Shareholder | Subsequent Event | CCOH
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of demand for repayment	$ 30.0