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Mergers and Acquisitions (Components of Purchase Consideration) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 08, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Dissenting shareholders' liability |  | $ 854.5 |  | $ 854.5 |  | $ 812.9
Cost basis |  | 2.6 |  | 2.6 |  | 2.6
Gain recognized on Starz available-for-sale securities |  | 0.0 | $ 20.4 | 0.0 | $ 20.4 |
Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Market value, as of December 8, 2016, of Starz Series A and Series B common stock already owned by Lionsgate | $ 179.3 |  |  |  |  |
Cash consideration paid to Starz stockholders | 1,176.1 |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | 1,327.7 |  |  |  |  |
Replacement of Starz share-based payment awards | 186.5 |  |  |  |  |
Total purchase consideration | 3,666.9 |  |  |  |  |
Cost basis | 158.9 |  |  |  |  |
Gain recognized on Starz available-for-sale securities |  |  |  |  |  | $ 20.4
Replacement of Starz share-based payment awards, unvested | 43.3 |  |  |  |  |
Starz Series A Common Stock | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration paid to Starz stockholders | $ 1,123.3 |  |  |  |  |
Cash to be paid per outstanding share (in usd per share) | $ 18.00 |  |  |  |  |
Starz Series A Common Stock | Starz | Class B Non-Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | $ 1,088.0 |  |  |  |  |
Stock conversion ratio | 0.6784 |  |  |  |  |
Starz Series B Common Stock | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration paid to Starz stockholders | $ 52.8 |  |  |  |  |
Cash to be paid per outstanding share (in usd per share) | $ 7.26 |  |  |  |  |
Starz Series B Common Stock | Starz | Class B Non-Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | $ 118.1 |  |  |  |  |
Stock conversion ratio | 0.6321 |  |  |  |  |
Starz Series B Common Stock | Starz | Class A Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | $ 121.6 |  |  |  |  |
Stock conversion ratio | 0.6321 |  |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dissenting shareholders' liability | $ 797.3 | $ 854.5 |  | $ 854.5 |  |

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