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Mergers and Acquisitions (Components of Purchase Consideration) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 08, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition [Line Items]        
Cost basis   $ 2.6 $ 2.6  
Gain recognized on Starz available-for-sale securities   0.0 20.4 $ 0.0
Dissenting shareholders' liability   $ 0.0 812.9  
Starz        
Business Acquisition [Line Items]        
Cost basis $ 158.9      
Gain recognized on Starz available-for-sale securities     $ 20.4  
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      
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 Common 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 Common 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 Common 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