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Stock-Based Compensation (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Stock-Based Compensation    
Summary of the total compensation expense and associated recognized income tax benefits
 
Three Months Ended
March 31,
 
2013
 
2012
Compensation expense
$
8.0

 
$
7.5

Income tax benefit
(3.1
)
 
(2.9
)
Total
$
4.9

 
$
4.6
A summary of the total compensation expense and associated income tax benefits recognized under the Prior Plans and the Omnibus Plan, including the cost of stock options, RSUs, and PSUs, is as follows (in millions of dollars):
 
Years Ended December 31,
 
2012
 
2011
 
2010
Compensation expense
$
30.3

 
$
31.0

 
$
36.6

Income tax benefit
(11.7
)
 
(12.0
)
 
(14.2
)
Total
$
18.6

 
$
19.0

 
$
22.4