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Investments (Equity Method Investments Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 15, 2019
Mar. 31, 2019
Mar. 31, 2021
Pop      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 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 and other investments $ 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     9.00%
Maximum      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     49.00%