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Stock-Based Compensation (Tables) | 12 Months Ended
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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

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- Definition Disclosure of components of a stock option or other award plan under which share-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from share-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from share-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 + Details
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- Definition All required disclosures by grouped ranges of option exercise prices, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f + Details
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