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Commitments and Contingencies (Narrative) (Details)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 08, 2018
USD ($)
Oct. 09, 2018
USD ($)
Aug. 30, 2016
Mar. 16, 2017
plaintiff
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Nov. 05, 2018
USD ($)
Dec. 08, 2016
USD ($)
shares
Mar. 31, 2016
USD ($)
Other Commitments [Line Items]                    
Redeemable noncontrolling interest         $ 127.6 $ 101.8 $ 93.8     $ 90.5
Operating leases, rental expense         $ 27.0 20.7 15.6      
Multiemployer benefit plans, funded status         At least 80 percent          
Multiemployer benefit plans, period contributions         $ 56.9 70.9 59.4      
Loss Contingencies [Line Items]                    
Contingencies, putative class action complaints filed, number     7              
Shareholder litigation settlements         114.1 $ 0.0 $ 0.0      
Petitions for appraisal filed | plaintiff       5            
Fiduciary Litigation                    
Loss Contingencies [Line Items]                    
Settlement payment amount   $ 92.5     92.5          
Insurance reimbursement, amount         37.8          
Shareholder litigation settlements         54.8          
Lawsuit for insurance reimbursement, amount               $ 10.0    
Appraisal Litigation                    
Loss Contingencies [Line Items]                    
Settlement payment amount $ 964.0       964.0          
Shareholder litigation settlements         $ 59.3          
Value of original merger consideration, dissenting shareholders liability accrued at time of acquisition                 $ 797.3  
Motion Picture Industry Pension Plan                    
Other Commitments [Line Items]                    
Multiemployer benefit plans, funded percentage         66.80%          
Screen Actors Guild - Producers Pension Plan                    
Other Commitments [Line Items]                    
Multiemployer benefit plans, funded percentage         76.97%          
Starz | Starz Dissenting Shareholders                    
Loss Contingencies [Line Items]                    
Outstanding equity interests (in shares) | shares                 22.5  
Value of original merger consideration, dissenting shareholders liability accrued at time of acquisition [1]                 $ 797.3  
[1] In connection with the Starz Merger, Starz received demands for appraisal from purported holders of approximately 22.5 million shares of Starz Series A common stock, and the Company recorded a dissenting shareholders' liability at the time of acquisition for the value of the original merger consideration attributable to the dissenting shareholders. As of March 31, 2018, the Company had not paid the merger consideration for the shares that had demanded appraisal but had recorded a liability of $869.3 million that was included in current dissenting shareholders' liability on the consolidated balance sheet for the estimated value of the merger consideration that would have been payable for such shares, plus interest accrued at the Federal Reserve discount rate plus 5%, compounded quarterly. In November 2018 a settlement agreement was reached and the dissenting shareholders' liability was paid. See Note 17 for further information.