Stock Based Compensation Share-based Compensation - Summary of Weighted Average Valuation Assumptions for Market Condition Performance Restricted Stock Units (Details) - Market Condition Based PRSUs	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Expected life (years)	2 years 10 months 9 days	2 years 10 months 9 days	2 years 10 months 9 days
Risk free interest rate	2.46%	2.38%	1.40%
Volatility	20.52%	21.79%	23.78%