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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule of Goodwill (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill |  |  |  |  |
Beginning balance | $ 2,145,935,000 | $ 3,325,622,000 |  | $ 2,145,935,000 | $ 3,325,622,000
Goodwill, Impairment Loss | 0 | (1,200,000,000) | $ 0 |  | (1,224,374,000)
Acquisitions |  |  |  | 169,298,000 | 44,606,000
Dispositions |  |  |  | (1,446,000) | (164,000)
Foreign currency |  |  |  | (206,000) | 245,000
Ending balance |  |  | 2,145,935,000 | 2,313,581,000 | 2,145,935,000
Multiplatform Group |  |  |  |  |
Goodwill |  |  |  |  |
Beginning balance | 1,462,217,000 |  |  | 1,462,217,000 |
Acquisitions |  |  |  | 1,267,000 |
Dispositions |  |  |  | (1,446,000) |
Foreign currency |  |  |  | 0 |
Ending balance |  |  | 1,462,217,000 | 1,462,038,000 | 1,462,217,000
Digital Audio Group |  |  |  |  |
Goodwill |  |  |  |  |
Beginning balance | 579,319,000 |  |  | 579,319,000 |
Acquisitions |  |  |  | 168,031,000 |
Dispositions |  |  |  | 0 |
Foreign currency |  |  |  | 0 |
Ending balance |  |  | 579,319,000 | 747,350,000 | 579,319,000
Audio & Media Services Group |  |  |  |  |
Goodwill |  |  |  |  |
Beginning balance | 104,399,000 |  |  | 104,399,000 |
Acquisitions |  |  |  | 0 |
Dispositions |  |  |  | 0 |
Foreign currency |  |  |  | (206,000) |
Ending balance |  |  | 104,399,000 | 104,193,000 | 104,399,000
Audio |  |  |  |  |
Goodwill |  |  |  |  |
Beginning balance | 2,041,536,000 | 3,221,468,000 |  | 2,041,536,000 | 3,221,468,000
Goodwill, Impairment Loss |  |  |  |  | (1,224,374,000)
Acquisitions |  |  |  |  | 44,606,000
Dispositions |  |  |  |  | (164,000)
Foreign currency |  |  |  |  | 0
Ending balance |  |  | 2,041,536,000 |  | 2,041,536,000
Audio & Media Services Group |  |  |  |  |
Goodwill |  |  |  |  |
Beginning balance | $ 104,399,000 | $ 104,154,000 |  | $ 104,399,000 | 104,154,000
Goodwill, Impairment Loss |  |  |  |  | 0
Acquisitions |  |  |  |  | 0
Dispositions |  |  |  |  | 0
Foreign currency |  |  |  |  | 245,000
Ending balance |  |  | $ 104,399,000 |  | $ 104,399,000

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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