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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) |  | 3 Months Ended | 4 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | May 01, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 3,323,365,000 | $ 3,325,622,000 | $ 2,145,935,000 | $ 2,313,581,000 | $ 2,145,935,000
Indefinite-lived intangibles - licenses |  |  |  | 2,281,720,000 |  | 1,770,345,000 | $ 1,778,045,000 | 1,770,345,000
Indefinite-lived intangible assets impairment test, forecast period |  |  |  |  |  |  | 10 years |
Finite-lived intangible assets impairment |  |  | $ 0 |  |  |  |  |
Amortization of intangible assets |  |  |  | 12,700,000 | 171,500,000 |  | $ 280,600,000 | 258,900,000
Goodwill impairment |  | $ 0 | 1,200,000,000 |  |  | 0 |  | 1,224,374,000
Audio |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 3,221,468,000 | 2,041,536,000 |  | 2,041,536,000
Goodwill, accumulated impairment loss |  |  |  |  | 3,500,000,000 |  |  |
Goodwill impairment |  |  |  |  |  |  |  | 1,224,374,000
Audio & Media Services Group |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 104,154,000 | $ 104,399,000 |  | 104,399,000
Goodwill, accumulated impairment loss |  |  |  |  | $ 212,000,000 |  |  |
Goodwill impairment |  |  |  |  |  |  |  | $ 0
Licensing Agreements |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Indefinite-lived intangibles - licenses |  |  |  | 2,281,720,000 |  |  |  |
Non-cash impairment charge |  |  | $ 502,700,000 | $ 91,400,000 |  |  |  |
Triton Digital |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Amount paid for acquisition | $ 228,500,000 |  |  |  |  |  |  |
Assets acquired | 69,400,000 | 69,400,000 |  |  |  |  |  |
Intangible assets acquired | 191,300,000 | 191,300,000 |  |  |  |  |  |
Goodwill | 168,000,000 | 168,000,000 |  |  |  |  |  |
Tax-deductible goodwill | 6,900,000 | 6,900,000 |  |  |  |  |  |
Liabilities assumed | $ 32,200,000 | $ 32,200,000 |  |  |  |  |  |

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