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Stock-Based Compensation
3 Months Ended
Mar. 31, 2017
Share-based Compensation [Abstract]  
Stock-Based Compensation
Stock-Based Compensation

A summary of stock-based compensation costs follows (in millions):
 
Three Months Ended 
 March 31,
 
2017
 
2016
 
 
 
 
Total stock-based compensation costs:
 
 
 
Restricted stock units
$

 
$
0.1

Stock options
0.1

 
0.1

Expense included in selling, general and administrative expense
$
0.1

 
$
0.2

 
 
 
 
Total recognized tax benefit
$

 
$



As of March 31, 2017, there was $0.6 million of unrecognized compensation cost related to unvested stock-based payments granted, of which $0.6 million relates to stock options and less than $0.1 million relates to unvested restricted stock units. That cost is expected to be recognized over a weighted-average period of 1.7 years.

Stock-based compensation cost is measured at the grant date, based on the fair value of the award, and is recognized on a straight-line basis over the requisite service period. Stock options vest and become exercisable in equal annual installments over a three- or four-year period and expire 10 years from the date of grant. There were no grants of stock-based compensation in the three months ended March 31, 2017 or 2016.