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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Numerator:      
Net loss attributable to Lions Gate Entertainment Corp. shareholders $ (1,102.9) $ (2,010.2) $ (188.2)
Accretion of redeemable noncontrolling interest (11.9) 0.0 0.0
Net loss attributable to Lions Gate Entertainment Corp. shareholders after accretion of redeemable noncontrolling interest, basic (1,114.8) (2,010.2) (188.2)
Net loss attributable to Lions Gate Entertainment Corp. shareholders after accretion of redeemable noncontrolling interest, diluted $ (1,114.8) $ (2,010.2) $ (188.2)
Denominator:      
Weighted average common shares outstanding, basic (in shares) 233.6 227.9 224.1
Weighted average common shares outstanding, diluted (in shares) 233.6 227.9 224.1
Basic net loss per common share (in usd per share) $ (4.77) $ (8.82) $ (0.84)
Diluted net loss per common share (in usd per share) $ (4.77) $ (8.82) $ (0.84)
Antidilutive securities excluded from the calculation of diluted earnings per share due to net loss, amount 2.9 2.9 5.3