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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders' Equity (Tables) [Abstract]  
Summary of common stock activity
The following table summarizes common stock activity from January 1, 2012 to December 31, 2014:
 
2014
 
2013
 
2012
 
(In millions)
Shares outstanding at the beginning of the year
270.1

 
268.6

 
271.1

Stock options exercised
—

 
0.1

 
0.2

Stock grants to employees
1.3

 
1.0

 
1.5

Employee stock purchases
0.5

 
0.5

 
0.3

Shares relinquished
(0.2
)
 
(0.1
)
 
(0.3
)
Shares repurchased
—

 
—

 
(4.2
)
Shares outstanding at the end of the year
271.7

 
270.1

 
268.6