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Net Income (Loss) Per Share (Diluted) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Numerator:    
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders $ (7.9) $ 173.8
Interest on convertible notes, net of tax 0.0 0.1
Numerator for diluted net income (loss) per common share $ (7.9) $ 173.9
Denominator:    
Weighted average common shares outstanding (in shares) 211.8 206.8
Effect of dilutive securities:    
Conversion of notes (in shares) 0.0 2.1
Share purchase options (in shares) 0.0 6.3
Restricted share units and restricted stock (in shares) 0.0 0.7
Contingently issuable shares 0.0 2.0
Adjusted weighted average common shares outstanding 211.8 217.9
Diluted net income (loss) per common share (in usd per share) $ (0.04) $ 0.80