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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 |  |  |  |  |  |  |  |  |  |

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