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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Goodwill [Roll Forward]
Balance, beginning of period		$ 2,764.5	$ 2,764.5
Impairment	$ (1,475.0)	(1,475.0)	0.0	$ 0.0
Balance, end of period		1,289.5	2,764.5	2,764.5
Motion Picture
Goodwill [Roll Forward]
Balance, beginning of period		393.7	393.7
Impairment		0.0
Balance, end of period		393.7	393.7	393.7
Television Production
Goodwill [Roll Forward]
Balance, beginning of period		401.9	401.9
Impairment		0.0
Balance, end of period		401.9	401.9	401.9
Media Networks
Goodwill [Roll Forward]
Balance, beginning of period		1,968.9	1,968.9
Impairment		(1,475.0)
Balance, end of period		$ 493.9	$ 1,968.9	$ 1,968.9

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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