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Equity (Tables)
9 Months Ended
Sep. 30, 2011
Stockholders' Equity Note [Abstract] 
Income per Share Calculations
Net income per share calculations for the quarter and nine months ended September 30, 2011 and October 1, 2010, respectively, are as follows (in millions, except per share data):
 
 
Quarter Ended
 
Nine Months Ended
 
September 30, 2011
 
October 1, 2010
 
September 30, 2011
 
October 1, 2010
Net income (loss) applicable to ON Semiconductor Corporation
$
(49.4
)
 
$
87.8

 
$
54.1

 
$
229.5

Basic weighted average common shares outstanding
448.8

 
431.6

 
445.5

 
430.0

Add: Incremental shares for:
 
 
 
 
 
 
 
Dilutive effect of stock options and awards
—

 
7.8

 
8.5

 
9.4

1.875% Convertible Senior Subordinated Notes
—

 
0.4

 
0.3

 
0.4

Diluted weighted average common shares outstanding
448.8

 
439.8

 
454.3

 
439.8

Net income (loss) per common share attributable to ON Semiconductor Corporation
 
 
 
 
 
 
 
Basic:
$
(0.11
)
 
$
0.20

 
$
0.12

 
$
0.53

Diluted:
$
(0.11
)
 
$
0.20

 
0.12

 
$
0.52