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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, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 08, 2016
USD ($)
Other Commitments [Line Items]            
Dissenting shareholders' liability     $ 812.9 $ 0.0    
Redeemable noncontrolling interest     93.8 90.5 $ 0.0  
Operating leases, rental expense     $ 15.6 14.2 13.5  
Multiemployer benefit plans, funded status     At least 80 percent      
Multiemployer benefit plans, period contributions     $ 35.5 $ 38.0 $ 20.5  
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     $ 812.9     $ 797.3