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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options Activity

Stock options A summary of the Plans’ shares under option for the three months ended March 31, 2012 is as follows:
 
Shares under option
(thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding and exercisable at December 31, 2011
2,220

 
$
29.36

 
4.1

 
$
76.3

Exercised
(602
)
 
$
26.97

 
 
 

Outstanding and exercisable at March 31, 2012
1,618

 
$
30.19

 
4.0

 
$
87.6
Allocation of Share-based Compensation Costs by Plan
Restricted stock compensation expense recorded in the Condensed Consolidated Statements of Operations is as follows:
 
Three Months Ended
March 31,
(millions of dollars, except per share data)
2012
 
2011
Restricted stock compensation expense
$
4.7

 
$
2.9

Restricted stock compensation expense, net of tax
$
3.5

 
$
2.2
Nonvested Restricted Stock Activity
A summary of the Company’s nonvested restricted stock for the three months ended March 31, 2012 is as follows:
 
Shares subject to restriction
(thousands)
 
Weighted average price
Nonvested at December 31, 2011
1,430

 
$
39.02

Granted
327

 
$
78.27

Vested
(631
)
 
$
26.42

Forfeited
(23
)
 
$
42.49

Nonvested at March 31, 2012
1,103

 
$
57.79