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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
	May 29, 2018	Nov. 12, 2015	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Redeemable Noncontrolling Interest [Line Items]
Initial fair value of redeemable noncontrolling interests			$ 15.8	$ 0.0	$ 0.0
3 Arts Entertainment
Redeemable Noncontrolling Interest [Line Items]
Initial fair value of redeemable noncontrolling interests	$ 15.8
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders	49.00%
First Put/ Call Option, Term			5 years
Put rights exercise period			60 days
Period after expiration of put rights that call rights begin			30 days
Call rights exercise period			60 days
Pilgrim Media Group
Redeemable Noncontrolling Interest [Line Items]
Initial fair value of redeemable noncontrolling interests		$ 90.1
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders		37.50%
Portion of noncontrolling interest redeemable after first term, five years after November 12, 2015			17.50%
First Put/ Call Option, Term			5 years
Second Put/ Call Option, Term			7 years

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- Definition

Derivative, Call Rights Exercise Period

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- Definition

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- Definition

Exercise period for put rights.

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- Definition

Derivative, Second Term of Contract.

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- Definition

The portion of redeemable noncontrolling interest, expressed as a percentage of the company acquired, that is redeemable at the completion of the first term.

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No definition available.

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Value of new stock classified as temporary equity issued during the period.

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