Stock-Based Compensation - Stock Option Black Scholes Option Pricing Model Assumptions (Details) - Share-based Payment Arrangement, Option [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Expected volatility	32.30%	31.70%	30.50%
Risk-free interest rate	1.30%	1.70%	2.80%
Expected term (years)	5 years 3 months 18 days	6 years 1 month 6 days	6 years 1 month 6 days