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PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Tables)
 6 Months Ended
Jun. 30, 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
2.0

 
—

 
2.0

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
(5.0
)
 
—

 
(5.0
)
Common shares at June 30, 2013
112.9

 
(22.4
)
 
90.5