Quarterly report pursuant to Section 13 or 15(d)

Stock Compensation Narrative (Details)

v3.4.0.3
Stock Compensation Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average remaining contractual term - options (in years) 4 years 10 months 4 days  
Weighted-average remaining contractual term - exercisable options (in years) 4 years 2 months 28 days  
Intrinsic value -outstanding options $ 107.6  
Intrinsic value - exercisable options 90.3  
Intrinsic Value, Exercises in Period 4.7 $ 21.7
Restricted shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate Intrinsic Value, Vested $ 1.4 $ 2.4
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, outstanding 100,122  
Forfeited 6,948  
Incentive Plan, Stock Options and Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 51.5  
Weighted average recognition period (in years) 2 years 5 months 16 days  
Liberty Media    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options, Outstanding 1,900,000  
Minimum | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, outstanding 50,061  
Maximum | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, outstanding 200,244