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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity (Tables) [Abstract]  
Summary of common stock activity
The following table summarizes common stock activity from January 1, 2014 to December 31, 2016:
 
2016
 
2015
 
2014
 
(In millions)
Shares outstanding at the beginning of the year
18.5

 
18.1

 
18.0

Stock grants to employees
—

 
0.2

 
0.1

Performance share contribution 401k
—

 
0.2

 
—

Shares outstanding at the end of the year
18.5

 
18.5

 
18.1