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Commitments and Contingencies (Narrative) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 09, 2018
USD ($)
Aug. 30, 2016
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Nov. 05, 2018
USD ($)
Mar. 31, 2018
USD ($)
Other Commitments [Line Items]              
Multiemployer Plan, Pension, Insignificant, Employer Contribution, Cost     $ 73.8 $ 55.5 $ 56.9    
Redeemable noncontrolling interest     $ 219.1 $ 167.8 127.6   $ 101.8
Multiemployer benefit plans, funded status     At least 80 percent        
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     67.50%        
Screen Actors Guild - Producers Pension Plan              
Other Commitments [Line Items]              
Multiemployer benefit plans, funded percentage     74.90%        
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