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Dispositions and Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 29, 2018
Mar. 31, 2021
Mar. 31, 2020
Business Acquisition [Line Items]      
Cash consideration   $ 123.6 $ 0.0
Goodwill allocated related to sale of Pantaya   $ 69.0  
Pantaya | Disposal Group, Not Discontinued Operations      
Business Acquisition [Line Items]      
Equity interest sold   75.00%  
Cash consideration   $ 123.6  
Gain on sale of Pantaya   44.1  
Goodwill allocated related to sale of Pantaya   $ 69.0  
3 Arts Entertainment      
Business Acquisition [Line Items]      
Equity interests acquired 51.00%    
Aggregate purchase price $ 166.6    
Percentage of cash consideration 50.00%    
Period for issuance of equity interests after closing date 1 year    
Deferred compensation arrangements $ 38.3    
Contingency period   5 years  
3 Arts Entertainment | Class B Non-Voting Common Shares      
Business Acquisition [Line Items]      
Percentage at closing 32.50%    
Percentage paid one-year from closing 17.50%