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Compensation and Benefits - Significant Assumptions (Details) - SLP Awards
12 Months Ended
Oct. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Risk-free interest rate 2.98%        
Expected volatility 30.00%        
Expected term of the awards granted during the period (years) 5 years        
Valuation, Income Approach | Measurement Input, Discount Rate | Minimum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 0.0990 0.038 0.036 0.0990 0.0980
Valuation, Income Approach | Measurement Input, Discount Rate | Maximum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 0.1080 0.112 0.121 0.1080 0.1110
Valuation, Market Approach | Measurement Input, Income Multiples | Minimum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 12.00     12.00 11.00
Valuation, Market Approach | Measurement Input, Income Multiples | Maximum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 20.00     20.00 14.00
Valuation, Market Approach | Measurement Input, Revenue Multiples | Minimum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 2.25     2.25 2.25
Valuation, Market Approach | Measurement Input, Revenue Multiples | Maximum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 4.00     4.00 4.25
Valuation, Market Approach | Measurement Input, Growth Rate | Minimum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 0.0250     0.0250 0.0250
Valuation, Market Approach | Measurement Input, Growth Rate | Maximum          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Measurement input 0.0275     0.0275 0.0275