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Share-Based Compensation - Summary Of Share-Based Compensation Expense (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024		Mar. 31, 2023		Mar. 31, 2022
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				$ 54.8		$ 69.2		$ 70.2
Impact of accelerated vesting on equity awards		$ 0.0	$ 0.5	7.7	[1]	4.2	[1]	0.0	[1]
Total share-based compensation expense		8.4	8.0	62.5		73.4		70.2
Tax impact				(15.1)		(17.8)		(16.7)
Reduction in net income				47.4		55.6		53.5
Stock options
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense		0.2	0.5
Share appreciation rights
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense		0.2	0.1
Reportable Subsegments
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				39.8		42.5		50.6
Reportable Subsegments | Stock options
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				1.7		2.3		9.6
Reportable Subsegments | Restricted share units and other share-based compensation
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				37.7		39.3		38.6
Reportable Subsegments | Share appreciation rights
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				0.4		0.9		2.4
Corporate Segment
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				15.0		26.7		19.6
Starz Business of Lions Gate Entertainment Corp
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				23.2		25.7		28.0
Impact of accelerated vesting on equity awards	[1]			1.4		0.0		0.0
Total share-based compensation expense		5.2	4.0	24.6		25.7		28.0
Tax impact				(5.9)		(6.2)		(6.7)
Reduction in net income				18.7		19.5		21.3
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				17.6		16.0		20.2
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments | Stock options
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				0.0		0.4		2.2
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments | Restricted share units and other share-based compensation
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:		4.5	2.6	17.6		15.7		16.9
Starz Business of Lions Gate Entertainment Corp | Reportable Subsegments | Share appreciation rights
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:				0.0		(0.1)		1.1
Starz Business of Lions Gate Entertainment Corp | Corporate Segment
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation Expense:		$ 0.7	$ 1.4	$ 5.6		$ 9.7		$ 7.8
[1] Represents share-based compensation expense included in restructuring and other expenses reflecting the impact of the acceleration of vesting schedules for equity awards pursuant to certain severance arrangements.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Section 50
-Paragraph 2
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