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Share-Based Compensation - Summary Of Share-Based Compensation Expense, By Expense Category (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]
Share-Based Compensation Expense:	$ 8.4	$ 8.0	$ 62.5	$ 73.4	$ 70.2
Starz Business of Lions Gate Entertainment Corp
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:	5.2	4.0	24.6	25.7	28.0
Direct Operating Expenses | Starz Business of Lions Gate Entertainment Corp
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:	0.6	0.4	2.7	1.6	1.2
Selling and Marketing Expense | Starz Business of Lions Gate Entertainment Corp
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:	0.2	0.2	0.8	0.7	0.5
General and administrative expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:			54.8	69.2	70.2
General and administrative expense | Starz Business of Lions Gate Entertainment Corp
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:	$ 4.4	$ 3.4	19.7	23.4	26.3
Restructuring and other
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:			7.7	4.2	0.0
Restructuring and other | Starz Business of Lions Gate Entertainment Corp
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-Based Compensation Expense:			$ 1.4	$ 0.0	$ 0.0

X

- Definition

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

+ References

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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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