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Restructuring and Other - Severance Liability Rollforward (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
Restructuring Cost and Reserve [Line Items]          
Beginning balance   $ 3.7 $ 3.7 $ 0.8 $ 3.9
Accruals     27.5 10.8 2.8
Severance payments     (11.9) (7.9) (5.9)
Ending Balance     19.3 3.7 0.8
Severance liability          
Restructuring and Other Severance Liability          
Beginning balance $ 19.3 3.7 3.7    
Accruals 3.0 2.0      
Severance payments (8.2) (4.9)      
Ending balance 14.1 0.8 19.3 3.7  
Starz Business of Lions Gate Entertainment Corp          
Restructuring Cost and Reserve [Line Items]          
Beginning balance 1.6 2.2 2.2 0.7 1.8
Accruals 0.0 0.8 5.4 4.2 1.8
Severance payments 0.9 1.1 (6.0) (2.7) (2.9)
Ending Balance $ 2.5 $ 4.1 $ 1.6 $ 2.2 $ 0.7