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Significant Accounting Policies (Basic Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Lions Gate Entertainment Corp. shareholders |  | $ 61.6 | $ (30.6) | $ (17.5) | $ 1.3 | $ 10.9 | [1] | $ 40.7 | [1] | $ (42.1) | [1] | $ 40.7 | [1] | $ 14.8 | $ 50.2 | $ 181.8
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 165.0 | 148.5 | 139.0
Basic net income per common share (in usd per share) |  | $ 0.30 | $ (0.19) | $ (0.12) | $ 0.01 | $ 0.34 |  | $ 0.27 |  | $ (0.28) |  | $ 0.28 |  | $ 0.09 | $ 0.34 | $ 1.31
[1] | During the second, third and fourth quarter of fiscal 2016, net income included restructuring and other items, net of tax, of $2.7 million, $11.7 million, and $1.5 million, respectively (see Note 15). For the third quarter of fiscal 2016, net income attributable to Lions Gate Entertainment Corp. shareholders included restructuring and other items, net of tax, of $4.0 million.
[2] | The weighted average common shares outstanding for the year ended March 31, 2017 do not include the equity portion of the merger consideration related to the dissenting Starz shareholders as discussed in Note 3 and Note 17.

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