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Share-Based Compensation - Summary Of Share-Based Compensation Expense (Parenthetical) (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 Payment Arrangement, Expense, after Tax     $ 47.4 $ 55.6 $ 53.5
Share-Based Payment Arrangement, Accelerated Cost $ 0.0 $ 0.5 7.7 [1] 4.2 [1] 0.0 [1]
Starz Business of Lions Gate Entertainment Corp          
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-Based Payment Arrangement, Expense, after Tax     18.7 19.5 21.3
Share-Based Payment Arrangement, Accelerated Cost [1]     1.4 0.0 0.0
Starz Business of Lions Gate Entertainment Corp | Discontinued Operations          
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Share-Based Payment Arrangement, Expense, after Tax $ 0.3 $ 0.3 1.8 $ 3.0 $ 1.9
Share-Based Payment Arrangement, Accelerated Cost     $ 0.4    
[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.