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Stock-Based Compensation
6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
 
Stock-Based Compensation Plans
 
All of our employees and our non-employee directors are eligible for awards under the Morningstar 2011 Stock Incentive Plan, which provides for a variety of stock-based awards, including stock options, restricted stock units, performance share awards, market stock units, and restricted stock.

The following table summarizes the stock-based compensation expense included in each of our operating expense categories:
 
 
Three months ended June 30
 
Six months ended June 30
(in millions)
 
2017

 
2016

 
2017

 
2016

Cost of revenue
 
$
2.3

 
$
2.0

 
$
4.4

 
$
4.0

Sales and marketing
 
0.7

 
0.5

 
1.4

 
1.0

General and administrative
 
2.7

 
1.3

 
5.2

 
2.8

Total stock-based compensation expense
 
$
5.7

 
$
3.8

 
$
11.0

 
$
7.8



As of June 30, 2017, the total unrecognized stock-based compensation cost related to outstanding restricted stock units, performance share awards, and market stock units expected to vest was $44.5 million, which we expect to recognize over a weighted average period of 34 months.