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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 29, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 2,833.5 $ 2,833.5 $ 2,740.8
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      
Period for weighted average closing price 20 days      
Deferred compensation arrangements $ 38.3      
Contingency period   5 years    
Noncontrolling interest, fair value 15.8      
Intangible assets 47.0      
Goodwill 92.7      
Business acquisition, transaction costs $ 1.3      
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%      
Customer relationships | 3 Arts Entertainment        
Business Acquisition [Line Items]        
Weighted-average useful life   12 years    
Noncontrolling Interest Holders | 3 Arts Entertainment        
Business Acquisition [Line Items]        
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders 49.00%