Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
Goodwill (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill impairment	$ 0.0		$ 0.0	$ 1,475.0	$ 0.0
Media Networks
Goodwill [Line Items]
Goodwill impairment				1,475.0
Media Networks \| Media Networks
Goodwill [Line Items]
Goodwill impairment		$ 1,475.0		$ 1,475.0