v3.3.1.900
Debt and Capital Lease Obligations (VM Credit Facility) (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
GBP (£)
Apr. 30, 2014
USD ($)
Apr. 30, 2014
GBP (£)
Jun. 07, 2013
USD ($)
Jun. 07, 2013
GBP (£)
VM Credit Facility [Member]            
Debt Instrument [Line Items]            
Unused borrowing capacity $ 1,028.4          
Outstanding principal amount $ 4,804.0          
EBITDA Minimum Percentage 80.00% 80.00%        
Minimum term after change in control lenders may cancel commitments 30 days          
Portion of debt, default of which triggers event of default $ 77.9 £ 50.0        
VM Credit Facility A [Member]            
Debt Instrument [Line Items]            
Facility amount   375.0     $ 584.3 £ 375.0
Unused borrowing capacity 0.0          
Outstanding principal amount $ 584.3          
Description of variable rate basis LIBOR          
Basis spread on variable rate 3.25%          
VM Credit Facility C [Member]            
Debt Instrument [Line Items]            
Facility amount         934.9 600.0
Outstanding principal amount     $ 779.7 £ 500.4    
VM Credit Facility B [Member]            
Debt Instrument [Line Items]            
Facility amount $ 2,755.0         2,755.0
Unused borrowing capacity 0.0          
Outstanding principal amount $ 2,744.0          
Description of variable rate basis LIBOR          
Basis spread on variable rate 2.75%          
VM Credit Facility D [Member]            
Debt Instrument [Line Items]            
Facility amount   100.0 155.8 100.0    
Unused borrowing capacity $ 0.0          
Outstanding principal amount $ 155.4          
Description of variable rate basis LIBOR          
Basis spread on variable rate 3.25%          
VM Credit Facility E [Member]            
Debt Instrument [Line Items]            
Facility amount   £ 849.4 $ 1,323.5 £ 849.4    
Unused borrowing capacity $ 0.0          
Outstanding principal amount $ 1,320.3          
Description of variable rate basis LIBOR          
Basis spread on variable rate 3.50%          
VM Credit Facility B, D and E [Member]            
Debt Instrument [Line Items]            
LIBOR interest rate floor 0.75% 0.75%        
VM Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Facility amount   £ 660.0     $ 1,028.4 £ 660.0
Unused borrowing capacity $ 1,028.4          
Outstanding principal amount $ 0.0          
Description of variable rate basis LIBOR          
Basis spread on variable rate 3.25%          
Fee on unused portion of credit facility 1.30%