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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Summary of changes in common stock issued and treasury stock
A summary of changes in common stock issued and treasury stock is presented below (in millions of shares):
 
 
Common Stock
 
Common Stock
in Treasury
December 31, 2012
 
880.9

 
(78.7
)
Exercise of stock options and conversion of restricted stock units
 
25.0

 
(0.5
)
Issuance of common stock for employee benefit plans
 
0.6

 
—

Shares repurchased under share repurchase program
 
—

 
(22.3
)
December 31, 2013
 
906.5

 
(101.5
)
Exercise of stock options and conversion of restricted stock units
 
18.3

 
(1.3
)
Issuance of common stock for employee benefit plans
 
—

 
0.2

Shares repurchased under share repurchase program
 
—

 
(22.0
)
December 31, 2014
 
924.8

 
(124.6
)
Exercise of stock options and conversion of restricted stock units
 
15.3

 
(1.2
)
Issuance of common stock for employee benefit plans
 
—

 
0.4

Shares repurchased under share repurchase program
 
—

 
(28.1
)
December 31, 2015
 
940.1

 
(153.5
)