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Commitments and Contingencies (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 09, 2018
USD ($)
Aug. 30, 2016
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Nov. 05, 2018
USD ($)
Mar. 31, 2017
USD ($)
Other Commitments [Line Items]                
Redeemable noncontrolling interest     $ 127.6 $ 167.8 $ 127.6 $ 101.8   $ 93.8
Multiemployer benefit plans, funded status       At least 80 percent        
Multiemployer benefit plans, period contributions       $ 55.5 56.9 $ 70.9    
Loss Contingencies [Line Items]                
Contingencies, putative class action complaints filed, number   7            
Motion Picture Industry Pension Plan                
Other Commitments [Line Items]                
Multiemployer benefit plans, funded percentage       66.50%        
Screen Actors Guild - Producers Pension Plan                
Other Commitments [Line Items]                
Multiemployer benefit plans, funded percentage       76.44%        
Fiduciary Litigation                
Loss Contingencies [Line Items]                
Settlement payment amount $ 92.5       92.5      
Insurance reimbursement, amount     $ 37.8   $ 37.8      
Lawsuit for insurance reimbursement, amount             $ 10.0