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Investments (Equity Method Investments Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Mar. 15, 2019
May 31, 2017
Mar. 15, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]            
Proceeds from the sale of equity method investee, net of transaction costs       $ 48.0 $ 393.7 $ 0.0
Gain (loss) on sale of equity method investments       (44.6) $ 201.0 $ 0.0
Pop            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 50.00%   50.00%   50.00% 50.00%
Redeemable Preferred Stock | Pop            
Schedule of Equity Method Investments [Line Items]            
Rate of dividend on preferred stock     10.00%      
Disposed by sale | EPIX            
Schedule of Equity Method Investments [Line Items]            
Ownership interest sold   31.15%        
Gain (loss) on sale of equity method investments         $ 201.0  
Disposed by sale | Pop            
Schedule of Equity Method Investments [Line Items]            
Ownership interest sold 50.00%          
Proceeds from the sale of equity method investee, net of transaction costs $ 48.0          
Gain (loss) on sale of equity method investments       $ (44.6)    
Minimum            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       11.00%    
Maximum            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       49.00%