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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Changes In Carrying Amount Of Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Dec. 31, 2020
Goodwill
Beginning balance	$ 2,145,935,000	$ 3,325,622,000	$ 2,145,935,000	$ 3,325,622,000
Impairment	0	(1,200,000,000)		(1,224,374,000)
Acquisitions			167,868,000	44,606,000
Dispositions			(290,000)	(164,000)
Foreign currency			(88,000)	245,000
Ending balance			2,313,425,000	2,145,935,000
Audio
Goodwill
Beginning balance	2,041,536,000	3,221,468,000	2,041,536,000	3,221,468,000
Impairment				(1,224,374,000)
Acquisitions				44,606,000
Dispositions				(164,000)
Foreign currency				0
Ending balance				2,041,536,000
Audio & Media Services Group
Goodwill
Beginning balance	104,399,000	$ 104,154,000	104,399,000	104,154,000
Impairment				0
Acquisitions			0	0
Dispositions			0	0
Foreign currency			(88,000)	245,000
Ending balance			104,311,000	104,399,000
Multiplatform Group
Goodwill
Beginning balance	1,462,217,000		1,462,217,000
Acquisitions			0
Dispositions			(290,000)
Foreign currency			0
Ending balance			1,461,927,000	1,462,217,000
Digital Audio Group
Goodwill
Beginning balance	$ 579,319,000		579,319,000
Acquisitions			167,868,000
Dispositions			0
Foreign currency			0
Ending balance			$ 747,187,000	$ 579,319,000

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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.

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