Quarterly report pursuant to Section 13 or 15(d)

Stock Compensation Narrative (Details)

v3.5.0.2
Stock Compensation Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 40.9  
Weighted average recognition period (in years) 2 years 1 month 16 days  
Weighted-average remaining contractual term - options (in years) 4 years 5 months 16 days  
Weighted-average remaining contractual term - exercisable options (in years) 3 years 9 months 12 days  
Intrinsic value -outstanding options $ 141.4  
Intrinsic value - exercisable options 115.7  
Intrinsic Value, Exercises in Period 21.7 $ 70.9
Restricted shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate Intrinsic Value, Vested $ 1.7 $ 2.5
Liberty Media    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock reserved for issuance (in shares) 1,600,000  
Share-based Compensation Award, Tranche One | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, outstanding 96,394  
Restricted Stock Units, Forfeited 10,676  
Share-based Compensation Award, Tranche One | Minimum | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, outstanding 48,197  
Restricted Stock Units, Forfeited 5,338  
Share-based Compensation Award, Tranche One | Maximum | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units, outstanding 192,788  
Restricted Stock Units, Forfeited 21,352  
Share-based Compensation Award, Tranche Two | Maximum | Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted Stock Units, Forfeited 8,548