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Debt (Narrative - Debt Transactions) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 22, 2018
Dec. 11, 2017
Dec. 08, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 28, 2018
Dec. 12, 2017
Dec. 07, 2016
Oct. 27, 2016
Debt Instrument [Line Items]                    
Loss on extinguishment of debt       $ 35.7 $ 40.4 $ 0.0        
Coupon rate       5.875%            
Principal amount of debt outstanding       $ 2,520.0 3,107.5          
Senior Secured Second-Priority Notes | 5.25% Senior Notes                    
Debt Instrument [Line Items]                    
Coupon rate       5.25%            
Principal amount of debt outstanding     $ 225.0              
Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit facility, maximum borrowing capacity $ 1,500.0   $ 1,000.0 $ 1,500.0         $ 800.0  
Debt instrument, term 5 years   5 years              
Outstanding obligations     $ 241.0              
Principal amount of debt outstanding       $ 0.0 0.0          
Revolving Credit Facility | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate       0.75%            
Revolving Credit Facility | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate       1.75%            
Term Loan | Previous Term Loan A                    
Debt Instrument [Line Items]                    
Debt instrument, term     5 years              
Principal amount of notes     $ 1,000.0              
Principal amount of debt prepaid $ 950.0                  
Term Loan | Previous Term Loan B                    
Debt Instrument [Line Items]                    
Debt instrument, term     7 years              
Principal amount of notes     $ 2,000.0         $ 900.0    
Previous Term loan B facility, initial issuance price, percentage     99.50%              
Principal amount of debt prepaid   $ 25.0                
Term Loan | Previous Term Loan B-1 Facility                    
Debt Instrument [Line Items]                    
Debt instrument, term   6 years                
Principal amount of notes   $ 900.0                
Principal amount of debt prepaid $ 825.0                  
Debt instrument, interest rate, stated percentage, amount less than previous interest rate   0.75%                
Term Loan | Previous Term Loan B-1 Facility | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate   1.25%                
Term Loan | Previous Term Loan B-1 Facility | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate   2.25%                
Term Loan | Term Loan A Facility                    
Debt Instrument [Line Items]                    
Debt instrument, term 5 years                  
Principal amount of notes $ 750.0                  
Principal amount of debt outstanding [1]       $ 750.0 987.5          
Term Loan | Term Loan A Facility | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate       0.75%            
Term Loan | Term Loan A Facility | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate       1.75%            
Term Loan | Term Loan B Facility                    
Debt Instrument [Line Items]                    
Debt instrument, term 7 years                  
Principal amount of notes $ 1,250.0                  
Principal amount of debt outstanding [1]       $ 1,250.0 1,600.0          
Term Loan | Term Loan B Facility | Base Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate 1.25%                  
Term Loan | Term Loan B Facility | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable interest rate 2.25%                  
Term Loan | Previous Term Loan B & Previous Term Loan B-1                    
Debt Instrument [Line Items]                    
Principal amount of debt prepaid       $ 740.0 $ 400.0          
Term Loan | Term Loan Due 2022                    
Debt Instrument [Line Items]                    
Debt instrument, term     7 years              
Principal amount of debt outstanding     $ 400.0              
Senior Notes | 2016 5.875% Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount of notes                   $ 520.0
Senior Notes | 2018 5.875% Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount of notes             $ 512.3      
Senior Notes | Starz Senior Notes                    
Debt Instrument [Line Items]                    
Principal amount of debt outstanding     675.0              
Starz | Starz Merger Financing                    
Debt Instrument [Line Items]                    
Proceeds from revolving credit facility used to finance a portion of Starz merger consideration     50.0              
Starz | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit facility, maximum borrowing capacity                 $ 1,000.0  
Outstanding obligations     $ 255.0              
Minimum | Revolving Credit Facility | LIBOR                    
Debt Instrument [Line Items]                    
Coupon rate       0.00%            
Minimum | Term Loan | Previous Term Loan B-1 Facility | LIBOR                    
Debt Instrument [Line Items]                    
Coupon rate   0.75%                
Minimum | Term Loan | Term Loan A Facility | LIBOR                    
Debt Instrument [Line Items]                    
Coupon rate       0.00%            
Minimum | Term Loan | Term Loan B Facility | LIBOR                    
Debt Instrument [Line Items]                    
Coupon rate       0.00%            
[1] As of March 31, 2017, amounts were outstanding under the Previous Term Loan A and Previous Term Loan B, as defined below under the "Debt Transactions" section.