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Description of Business, Basis of Presentation and Significant Accounting Policies (Basic and Diluted Net Loss Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Numerator:      
Net loss attributable to Lions Gate Entertainment Corp. shareholders $ (2,010.2) $ (188.2) $ (18.9)
Denominator:      
Weighted average common shares outstanding (in shares) 227.9 224.1 220.5
Basic net loss per common share (in usd per share) $ (8.82) $ (0.84) $ (0.09)
Diluted net loss per common share (in usd per share) $ (8.82) $ (0.84) $ (0.09)
Antidilutive securities excluded from the calculation of diluted earnings per share due to net loss, amount 2.9 5.3 2.2