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Goodwill and Intangible Assets (Goodwill) (Details) $ in Millions	12 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 2,833.5
Sale of Pantaya	(69.0)
Balance, end of period	2,764.5
Disposal Group, Not Discontinued Operations | Pantaya
Goodwill [Roll Forward]
Sale of Pantaya	(69.0)
Motion Picture
Goodwill [Roll Forward]
Balance, beginning of period	393.7
Sale of Pantaya	0.0
Balance, end of period	393.7
Television Production
Goodwill [Roll Forward]
Balance, beginning of period	401.9
Sale of Pantaya	0.0
Balance, end of period	401.9
Media Networks
Goodwill [Roll Forward]
Balance, beginning of period	2,037.9
Sale of Pantaya	(69.0)
Balance, end of period	$ 1,968.9

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

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))
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-Publisher FASB
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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.

+ References

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