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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Stock-Based Compensation - (Tables) [Abstract]  
Disclosure of Share-based Compensation Arrangements By Share-based Payment Award Table
 
2011
2010
2009
Stock based compensation
$ 31.7
$ 25.2
$   27.5
Tax benefit recognized in net income
11.1
8.8
9.6
Windfall tax benefit/(shortfall), net
12.7
7.3
2.0
Summary of Options Outstanding and Exercisable, by Range of Exercise Prices Table
 
Number of shares
Weighted average exercise price per share
Weighted average contractual term
Aggregate intrinsic value
Outstanding at January 1, 2011
3,933,440
$ 42.32
   
         
Granted
755,000
74.06
   
Exercised
(839,881)
33.62
 
 
Canceled
(25,897)
53.23
   
Outstanding at December 31, 2011
3,822,662
50.44
5.78
$ 139,243,760
Exercisable at December 31, 2011
2,238,712
$ 42.62
4.11
$ 99,065,980


The following table summarizes information for stock options outstanding at December 31, 2011:

 
Outstanding options
Exercisable options
Exercise price
Number
Average
exercise
price
Average  remaining
life (years)
Number
Average
exercise
price
$   14.73 - 20.00
281,938
$    19.05
0.9
281,938
$    19.05
20.01 - 30.00
222,096
23.48
2.1
222,096
23.48
30.01 - 40.00
186,322
32.12
0.3
186,322
32.12
40.01 - 50.00
657,166
42.77
4.7
503,790
43.03
50.01 - 60.00
1,691,307
53.47
6.5
1,009,258
53.94
60.01 - 70.00
135,333
67.69
9.3
12,501
64.49
70.01 - 80.00
570,100
73.59
9.1
0
0.0
80.01 - 86.46
78,400
84.19
9.2
22,807
84.13
$   14.73 - 66.44
3,822,662
$  50.44
5.8
2,238,712
$  42.62

At December 31, 2011, there was $18.7 million of total unrecognized compensation expense related to nonvested options granted under the Company's share-based payment plans. That cost is expected to be recognized over a weighted-average period of 1.8 years. The total intrinsic value of options exercised in 2011, 2010 and 2009 was $41.2 million, $27.5 million and $10.5 million, respectively. Cash received from option exercises under all plans in 2011 and 2010 was $28.2 million and $29.0 million, respectively.

 
Restricted Stock Grants - During 2011 and 2010, the Company granted 352,330 and 257,893 shares, respectively, of restricted stock to certain employee and director participants under the 2006 Plan. Restricted stock grants generally vest over a period of 1 to 3 years. The weighted average fair value of the shares granted in 2011 was $74.66 per share. The Company recorded $19.5 million, $16.2 million and $18.3 million of compensation expense related to outstanding shares of restricted stock held by employees and directors during 2011, 2010 and 2009, respectively. A summary of the Company's nonvested shares activity for 2011 is as follows:

 
Number of shares
Weighted average fair value
Nonvested at January 1, 2011
670,401
$  52.64
Granted
352,330
74.66
Vested
(264,848)
78.12
Forfeited
(4,072)
54.38
Nonvested at December 31, 2011
753,811
$  61.15