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Description of Business, Basis of Presentation and Significant Accounting Policies (Basic Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Lions Gate Entertainment Corp. shareholders | $ (44.9) | $ (91.2) | $ 1.8 | $ (54.0) | $ (155.2) | $ 22.9 | $ (144.1) | $ (7.9) | $ (188.4) | $ (284.2) | $ 473.6
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 217.9 | 213.7 | 208.4
Basic net income (loss) per common share (in usd per share) | $ (0.20) | $ (0.42) | $ 0.01 | $ (0.25) | $ (0.72) | $ 0.11 | $ (0.67) | $ (0.04) | $ (0.86) | $ (1.33) | $ 2.27

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