XML 71 R116.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Share-based Compensation - Performance Units Narratives (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award      
Recognition period for unrecognized share based compensation 1 year 10 months 24 days    
Share based compensation not yet recognized $ 9.5    
Performance units      
Share-based Compensation Arrangement by Share-based Payment Award      
Award vesting period 3 years    
Percentage of earn-out granted 100.00%    
Recognition period for unrecognized share based compensation 1 year 10 months 24 days    
Share based compensation not yet recognized $ 1.4    
Granted (usd per share) $ 69.53 $ 49.38 $ 37.34
Fair value of shares vested $ 1.1 $ 0.1 $ 0.8
Performance units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of earn-out granted 0.00%    
Performance units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of earn-out granted 200.00%