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Income Taxes - Summary Of Company's Current And Deferred Income Tax Provision (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
Schedule Of Current And Deferred Income Tax Provision [Line Items]          
Income tax expense benefit discontinued operations $ 5.0 $ 6.6 $ 34.2 $ 14.3 $ 17.3
STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP.          
Schedule Of Current And Deferred Income Tax Provision [Line Items]          
Income tax expense benefit discontinued operations $ (7.6) $ 0.4 (128.9) (18.3) 7.1
Discontinued Operations | STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP.          
Schedule Of Current And Deferred Income Tax Provision [Line Items]          
Income tax expense benefit discontinued operations     $ 24.2 $ 100.3 $ 37.3