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Mergers and Acquisitions (Components of Estimated Purchase Consideration) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 08, 2016
Mar. 31, 2017
Sep. 30, 2017
Business Acquisition [Line Items]      
Dissenting shareholders' liability   $ 812.9 $ 840.1
Cost basis   2.6 2.6
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 preliminary estimated 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   $ 840.1