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Net Income per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The Company computed basic and diluted net income per share as follows (in millions, except per share amounts):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Numerator:
 
 
 
 
 
 
 
Net income
$
97.9

 
$
57.7

 
$
188.9

 
$
74.0

Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute
  basic net income per share
503.0

 
527.8

 
503.8

 
528.0

Dilutive effect of employee stock awards
3.3

 
4.0

 
6.6

 
5.8

Weighted-average shares used to compute
  diluted net income per share
506.3

 
531.8

 
510.4

 
533.8

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.19

 
$
0.11

 
$
0.37

 
$
0.14

Diluted
$
0.19

 
$
0.11

 
$
0.37

 
$
0.14