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Share-Based Compensation - Summary Of Share-Based Compensation Expense (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

12 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Sep. 30, 2024

Sep. 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

$ 4.6

$ 0.0

$ 4.6

$ 0.5

7.7

^[1]

4.2

^[1]

0.0

^[1]

Total share-based compensation expense

8.6

13.5

17.0

21.4

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

0.4

0.9

Share appreciation rights

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]

Total share-based compensation expense

$ 0.2

$ 0.1

0.3

0.2

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:

9.3

12.1

23.2

25.7

28.0

Impact of accelerated vesting on equity awards

^[1]

0.3

^[2]

0.9

^[2]

1.4

0.0

0.0

Total share-based compensation expense

9.6

^[3]

13.0

^[3]

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:

8.6

9.3

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

$ 2.8

$ 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.
[2]	Represents the impact of the acceleration of vesting schedules for equity awards pursuant to certain severance arrangements.
[3]	Entered into during the three months ended September 30, 2024.

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+ 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

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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