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PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Tables)
 6 Months Ended
Jun. 30, 2012
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, 2011
120.0

 
(22.2
)
 
97.8

Common stock issued under employee stock plans
1.0

 
—

 
1.0

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

 
—

 
—

Surrender of restricted stock and performance share awards
—

 
(0.1
)
 
(0.1
)
Retirement of common stock
(2.9
)
 
—

 
(2.9
)
Common shares at June 30, 2012
118.1

 
(22.3
)
 
95.8