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Stock-Based Compensation Expense - Fair Value Calculation Assumptions (Details)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate, minimum 0.29% 1.39%
Risk-free interest rate, maximum 1.67% 2.56%
Expected price volatility, minimum 38.65% 28.66%
Expected price volatility, maximum 45.12% 35.79%
Stock Options | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option term / Performance Period 4 years 3 years
Stock Options | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option term / Performance Period 5 years 5 years
Stock-Settled Performance-Based Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate, minimum 1.10%  
Risk-free interest rate, maximum 1.30%  
Expected price volatility, minimum 40.20%  
Expected price volatility, maximum 56.10%  
Stock-Settled Performance-Based Restricted Stock Units | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option term / Performance Period 9 months 18 days  
Stock-Settled Performance-Based Restricted Stock Units | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected option term / Performance Period 2 years 9 months 18 days