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Equity Awards - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted 0 0    
Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contractual life of option (in years) 7 years      
Total intrinsic value of options exercised $ 8.2 $ 4.6 $ 20.4  
Aggregate intrinsic value of options outstanding 7.1 9.4 18.5  
Aggregate intrinsic value of options exercisable $ 7.1 $ 8.5 $ 14.9  
Fair value of shares used in calculation of intrinsic values (in dollars per share) $ 41.21 $ 36.54 $ 40.01  
Weighted-average remaining contractual life of options outstanding (in years) 2 years 10 months 24 days      
Weighted-average remaining contractual life of options exercisable (in years) 2 years 9 months 18 days      
Options granted 0 0 205,244  
Weighted-average fair value of options granted (in dollars per share)     $ 8.21  
Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
Total fair value of shares vested $ 5.3 $ 3.2 $ 5.5  
Unrecognized share based compensation expense $ 8.6      
Weighted-average period of unrecognized share based compensation expense (in years) 1 year 8 months 12 days      
RSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 1 year      
RSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 5 years      
2014 Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for issuance 4,171,150      
Number of shares available for grant 1,575,359      
2014 Non-Employee Director Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares available for issuance 150,000      
Number of shares available for grant 108,594      
Increase in number of common shares authorized for issuance       100,000
Non-employee directors | RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 1 year