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Stock Based Compensation - (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of RSU and RSA Activity Under Equity-Based Plans
The following tables summarize RSU and RSA activity for the three months ended March 31, 2021:
Time-based RSUs and RSAs
Total Number
of RSUs
Total Number
of RSAs
Total Number
of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 20201,230,071 30,026 1,260,097 $54.04 
Granted456,421 — 456,421 83.11 
Vested(212,948)(7,055)(220,003)45.14 
Forfeited(47,908)— (47,908)56.14 
Nonvested at March 31, 20211,425,636 22,971 1,448,607 $64.48 
Performance-based RSUs and RSAs
Total Number
of RSUs
Total Number
of RSAs
Total Number of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2020167,127 16,052 183,179 $52.89 
Granted232,815 — 232,815 68.27 
Vested(3,010)(16,052)(19,062)47.61 
Forfeited(9,459)— (9,459)52.86 
Nonvested at March 31, 2021

387,473 — 387,473 $62.39 
Stock-based Compensation Expense
Stock based compensation expense for stock based awards made to our employees pursuant to our equity plans were as follows:  
 Three Months Ended March 31,
(in millions)20212020
Cost of providing services$3 $2 
Sales and marketing1 2 
General and administrative6 5 
Systems development and programming costs1 — 
Total stock based compensation expense$11 $9