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Stock Based Compensation - (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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 
Granted491,136 — 491,136 82.72 
Vested(343,508)(12,797)(356,305)50.45 
Forfeited(94,764)— (94,764)58.05 
Nonvested at June 30, 20211,282,935 17,229 1,300,164 $65.57 
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 
Granted246,349 — 246,349 67.70 
Vested(3,010)(16,052)(19,062)47.61 
Forfeited(9,459)— (9,459)52.86 
Nonvested at June 30, 2021

401,007 — 401,007 $62.24 
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 June 30,Six Months Ended June 30,
(in millions)2021202020212020
Cost of providing services$3 $3 $6 $5 
Sales and marketing2 1 3 3 
General and administrative7 6 13 11 
Systems development and programming costs1 1 2 1 
Total stock based compensation expense$13 $11 $24 $20