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PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Tables)
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity Note [Abstract]  
Changes in common shares issued and held in treasury
The changes in common shares issued and held in treasury are summarized below:

 
Issued
 
Held in
Treasury
 
Outstanding
Common shares at December 31, 2012
115.8

 
(22.3
)
 
93.5

Common stock issued under employee stock plans
0.6

 
—

 
0.6

Common stock issued upon conversion of zero-coupon subordinated notes
0.1

 
—

 
0.1

Surrender of restricted stock and performance share awards
—

 
(0.1
)
 
(0.1
)
Retirement of common stock
(1.3
)
 
—

 
(1.3
)
Common shares at March 31, 2013
115.2

 
(22.4
)
 
92.8