v3.25.2
Capital Stock - Schedule of Stock Option, SARs, Restricted Stock and Restricted Share Unit Activity (Details) - $ / shares
shares in Millions
1 Months Ended 2 Months Ended 3 Months Ended
May 06, 2025
Jun. 30, 2025
Jun. 30, 2025
Stock Options and SARs      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 0.0 0.0 0.0
Conversion (in shares)   17.1  
Granted (in shares) 0.0 0.0  
Options exercised (in shares) 0.0 0.0  
Forfeited or expired (in shares) 0.0 0.0  
Outstanding, ending balance (in shares) 0.0 17.1 17.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding, beginning balance, weighted average exercise price (in usd per share) $ 0 $ 0 $ 0
Conversion, weighted average exercise price (in usd per share)   15.09  
Granted, weighted average exercise price (in usd per share) 0 0  
Options exercised, weighted average exercise price (in usd per share) 0 0  
Forfeited or expired, weighted average exercise price (in usd per share) 0 13.38  
Outstanding, Ending balance, weighted average exercise price (in usd per share) $ 0 $ 15.09 $ 15.09
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Granted in shares (less than) 0.0 0.0  
Restricted Stock and Restricted Share Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 0.0 0.0 0.0
Conversion (in shares)   11.0  
Granted (in shares) 0.0 0.1  
Vested (in shares) 0.0 (0.2)  
Forfeited or expired (in shares) 0.0 (0.9)  
Outstanding, Ending balance (in shares) 0.0 10.0 10.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, beginning balance, weighted average grant-date fair value (in usd per share) $ 0 $ 0 $ 0
Conversion, weighted average grant date fair value (in usd per share)   8.16  
Granted, weighted average grant date fair value (in usd per share) 0 7.34  
Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) 0 9.08  
Forfeited or expired, weighted average grant-date fair value (in usd per share) 0 8.19  
Outstanding, Ending balance, weighted average grant-date fair value (in usd per share) $ 0 $ 8.13 $ 8.13
Class A Voting Shares | Stock Options and SARs | Old Lionsgate      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 2.3 2.3 2.3
Conversion (in shares)   (2.3)  
Granted (in shares) 0.0 0.0  
Options exercised (in shares) 0.0 0.0  
Forfeited or expired (in shares) 0.0 0.0  
Outstanding, ending balance (in shares) 2.3 0.0 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding, beginning balance, weighted average exercise price (in usd per share) $ 23.10 $ 23.09 $ 23.10
Conversion, weighted average exercise price (in usd per share)   0  
Granted, weighted average exercise price (in usd per share) 0 0  
Options exercised, weighted average exercise price (in usd per share) 0 0  
Forfeited or expired, weighted average exercise price (in usd per share) 7.70 0  
Outstanding, Ending balance, weighted average exercise price (in usd per share) $ 23.09 $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Granted in shares (less than) 0.0 0.0  
Class A Voting Shares | Restricted Stock and Restricted Share Units (RSUs) | Old Lionsgate      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 0.1 0.1 0.1
Conversion (in shares)   (0.1)  
Granted (in shares) 0.0 0.0  
Vested (in shares) 0.0 0.0  
Forfeited or expired (in shares) 0.0 0.0  
Outstanding, Ending balance (in shares) 0.1 0.0 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, beginning balance, weighted average grant-date fair value (in usd per share) $ 8.39 $ 8.39 $ 8.39
Conversion, weighted average grant date fair value (in usd per share)   0  
Granted, weighted average grant date fair value (in usd per share) 0 0  
Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) 8.41 0  
Forfeited or expired, weighted average grant-date fair value (in usd per share) 0 0  
Outstanding, Ending balance, weighted average grant-date fair value (in usd per share) $ 8.39 $ 0 $ 0
Class B Non-Voting Shares | Stock Options and SARs      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted (in shares)     0.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Granted in shares (less than)     0.1
Class B Non-Voting Shares | Stock Options and SARs | Old Lionsgate      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 14.8 14.8 14.8
Conversion (in shares)   (14.8)  
Granted (in shares) 0.0 0.0  
Options exercised (in shares) 0.0 0.0  
Forfeited or expired (in shares) 0.0 0.0  
Outstanding, ending balance (in shares) 14.8 0.0 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Outstanding, beginning balance, weighted average exercise price (in usd per share) $ 13.86 $ 13.86 $ 13.86
Conversion, weighted average exercise price (in usd per share)   0  
Granted, weighted average exercise price (in usd per share) 0 0  
Options exercised, weighted average exercise price (in usd per share) 7.13 0  
Forfeited or expired, weighted average exercise price (in usd per share) 11.29 0  
Outstanding, Ending balance, weighted average exercise price (in usd per share) $ 13.86 $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Granted in shares (less than) 0.0 0.0  
Class B Non-Voting Shares | Restricted Stock and Restricted Share Units (RSUs) | Old Lionsgate      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 11.1 11.2 11.1
Conversion (in shares)   (11.2)  
Granted (in shares) 0.1 0.0  
Vested (in shares) 0.0 0.0  
Forfeited or expired (in shares) 0.0 0.0  
Outstanding, Ending balance (in shares) 11.2 0.0 0.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding, beginning balance, weighted average grant-date fair value (in usd per share) $ 8.17 $ 8.16 $ 8.17
Conversion, weighted average grant date fair value (in usd per share)   0  
Granted, weighted average grant date fair value (in usd per share) 7.29 0  
Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) 7.55 0  
Forfeited or expired, weighted average grant-date fair value (in usd per share) 7.97 0  
Outstanding, Ending balance, weighted average grant-date fair value (in usd per share) $ 8.16 $ 0 $ 0