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Commitments and Contingencies (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 30, 2016
Mar. 16, 2017
plaintiff
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Other Commitments [Line Items]            
Dissenting shareholders' liability     $ 869.3 $ 0.0    
Redeemable noncontrolling interest     101.8 93.8 $ 90.5 $ 0.0
Operating leases, rental expense     $ 20.7 15.6 14.2  
Multiemployer benefit plans, funded status     At least 80 percent      
Multiemployer benefit plans, period contributions     $ 70.9 $ 59.4 $ 60.0  
Contingencies, putative class action complaints filed, number 7          
Petitions for appraisal filed | plaintiff   5        
Starz | Starz Dissenting Shareholders            
Other Commitments [Line Items]            
Dissenting shareholders' liability     $ 869.3      
Motion Picture Industry Pension Plan            
Other Commitments [Line Items]            
Multiemployer benefit plans, funded percentage     67.40%      
Screen Actors Guild - Producers Pension Plan            
Other Commitments [Line Items]            
Multiemployer benefit plans, funded percentage     78.15%