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Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021
Goodwill [Line Items]
Goodwill	$ 2,426,379,000	$ 2,426,379,000	$ 2,426,379,000
Change in goodwill	$ 0
Peter B. Cannell & Co.
Goodwill [Line Items]
Goodwill, written off related to sale of business Unit		$ 9,800,000

X

- 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

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

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+ References

No definition available.

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- Definition

Amount of divestiture 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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