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Investments (Equity Method Investments Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 15, 2019
May 31, 2017
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Proceeds from the sale of equity method investee, net of transaction costs     $ 0.0 $ 48.0 $ 393.7
Gain (loss) on sale of equity method investments     $ 0.0 $ (44.6) $ 201.0
Pop          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%       50.00%
Ownership interest sold 50.00%        
Redeemable Preferred Stock | Pop          
Schedule of Equity Method Investments [Line Items]          
Rate of dividend on preferred stock       10.00%  
Disposed by sale | Pop          
Schedule of Equity Method Investments [Line Items]          
Proceeds from the sale of equity method investee, net of transaction costs $ 48.0        
Gain (loss) on sale of equity method investments       $ 44.6  
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
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%