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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options Activity

Stock options A summary of the Company’s stock option activity for the nine months ended September 30, 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

Exercised
(31
)
 
$
28.14

 
 
 
 
Outstanding and exercisable at June 30, 2012
1,587

 
$
30.23

 
3.7
 
$
56.1

Exercised
(105
)
 
$
27.26

 
 
 
 
Outstanding and exercisable at September 30, 2012
1,482

 
$
30.43

 
3.6
 
$
57.3
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
September 30,
 
Nine Months Ended
September 30,
(millions of dollars)
2012
 
2011
 
2012
 
2011
Restricted stock compensation expense
$
5.0

 
$
3.4

 
$
14.9

 
$
11.0

Restricted stock compensation expense, net of tax
$
3.7

 
$
2.6

 
$
10.9

 
$
8.4
Nonvested Restricted Stock Activity
A summary of the Company’s nonvested restricted stock for the nine months ended September 30, 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

Granted
11

 
$
82.33

Vested
(25
)
 
$
38.82

Forfeited
(4
)
 
$
58.72

Nonvested at June 30, 2012
1,085

 
$
58.47

Vested
(8
)
 
$
45.88

Forfeited
(21
)
 
$
55.83

Nonvested at September 30, 2012
1,056

 
$
58.62