XML 104 R90.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-Based Payments (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding in Shares [Roll Forward]    
Number of shares outstanding at December 31 (shares) 1,814,051  
Number of shares exercised (692,784)  
Number of shares cancelled (99,730)  
Number of shares outstanding at December 31 (shares) 1,021,537 1,814,051
Number of shares exercisable at December 31 (shares) 1,021,537  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Weighted average exercise price outstanding, beginning $ 73  
Weighted average exercise price exercised 76  
Weighted average exercise price cancelled 101  
Weighted average exercise price outstanding, ending 69 $ 73
Weighted average exercise price exercisable $ 69  
Weighted average remaining contractual life outstanding 2 years 11 months 3 years 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 2 years 11 months  
Aggregate intrinsic value outstanding, beginning $ 38.7  
Aggregate intrinsic value outstanding, ending 47.4 $ 38.7
Aggregate intrinsic value exercisable $ 47.4