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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