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Mergers and Acquisitions (Components of Estimated Purchase Consideration) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 08, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Business Acquisition [Line Items]        
Cost basis   $ 2.6 $ 158.9  
Gain recognized on Starz available-for-sale securities   20.4 0.0 $ 0.0
Dissenting shareholders' liability   812.9 $ 0.0  
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 preliminary estimated 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      
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      
Starz Series B Common Stock | Starz        
Business Acquisition [Line Items]        
Cash consideration paid to Starz stockholders 52.8      
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      
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      
Starz Dissenting Shareholders | Starz        
Business Acquisition [Line Items]        
Dissenting shareholders' liability $ 797.3 $ 812.9