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Contingencies (Narrative) (Details)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Aug. 30, 2016
Mar. 16, 2017
plaintiff
Jun. 30, 2018
USD ($)
shares
Mar. 31, 2018
USD ($)
Loss Contingencies [Line Items]        
Dissenting shareholders' liability     $ 885.2 $ 869.3
Interest Rate, Percentage Spread on Federal Reserve Discount Rate     5.00%  
Contingencies, putative class action complaints filed, number 7      
Petitions for appraisal filed | plaintiff   5    
Starz Dissenting Shareholders | Starz        
Loss Contingencies [Line Items]        
Outstanding equity interests (in shares) | shares     22.5  
Dissenting shareholders' liability     $ 885.2