Annual report pursuant to Section 13 and 15(d)

Stock Plans and Management Compensation (Details)

v2.4.0.6
Stock Plans and Management Compensation (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding, beginning (in shares) 9,200,000    
Outstanding, ending (in shares) 9,300,000    
Exercisable (in shares) 5,100,000 3,800,000  
Non-vested Stock Award Activity [Roll Forward]      
Percentage of premium paid out to directors in deferred company common stock (in hundredths) 20.00%    
Weighted average period 1.1    
Range 01 [Member]
      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit (in dollars per share) $ 3.37    
Exercise price range, upper range limit (in dollars per share) $ 5.99    
Number of outstanding options (in shares) 2,746,000    
Outstanding options, weighted average remaining years of contractual life (in years) 7.1    
Outstanding options, weighted average exercise price (in dollars per share) $ 5.06    
Number of options exercisable (in shares) 1,453,000    
Exercisable options, weighted average remaining years of contractual life (in years) 7.1    
Exercisable options, weighted average exercise price (in dollars per share) $ 4.84    
Range 02 [Member]
      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit (in dollars per share) $ 6.00    
Exercise price range, upper range limit (in dollars per share) $ 19.90    
Number of outstanding options (in shares) 3,749,000    
Outstanding options, weighted average remaining years of contractual life (in years) 7.1    
Outstanding options, weighted average exercise price (in dollars per share) $ 13.83    
Number of options exercisable (in shares) 1,695,000    
Exercisable options, weighted average remaining years of contractual life (in years) 6.4    
Exercisable options, weighted average exercise price (in dollars per share) $ 15.33    
Range 03 [Member]
      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit (in dollars per share) $ 19.91    
Exercise price range, upper range limit (in dollars per share) $ 39.56    
Number of outstanding options (in shares) 2,453,000    
Outstanding options, weighted average remaining years of contractual life (in years) 5.4    
Outstanding options, weighted average exercise price (in dollars per share) $ 29.19    
Number of options exercisable (in shares) 1,556,000    
Exercisable options, weighted average remaining years of contractual life (in years) 3.3    
Exercisable options, weighted average exercise price (in dollars per share) $ 33.60    
Range 04 [Member]
      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Exercise price range, lower range limit (in dollars per share) $ 39.57    
Exercise price range, upper range limit (in dollars per share) $ 46.25    
Number of outstanding options (in shares) 399,000    
Outstanding options, weighted average remaining years of contractual life (in years) 2.5    
Outstanding options, weighted average exercise price (in dollars per share) $ 46.02    
Number of options exercisable (in shares) 399,000    
Exercisable options, weighted average remaining years of contractual life (in years) 2.5    
Exercisable options, weighted average exercise price (in dollars per share) $ 46.02    
Stock Appreciation Rights (SARs) [Member]
      
Aggregate Intrinsic Value [Abstract]      
Weighted average fair values of individual SARs granted (in dollars per share) $ 10.59 $ 5.68 $ 2.99
Stock Options and SAR's [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized number of shares (in shares) 13,100,000    
Number of shares available for grant (in shares) 2,500,000    
Period for stock options and SARs to be exercisable (in years) 10    
Awards vesting period (in years) 4Y    
SARs/Stock Options Outstanding [Roll Forward]      
Outstanding, beginning (in shares) 9,168,000 8,332,000 6,484,000
Granted (in shares) 1,105,000 1,987,000 2,911,000
Exercised (in shares) (556,000) (261,000) (1,000)
Forfeited (in shares) (370,000) (890,000) (1,062,000)
Outstanding, ending (in shares) 9,347,000 9,168,000 8,332,000
Exercisable (in shares) 5,103,000 3,809,000 3,271,000
Weighted Average Exercise Price [Abstract]      
Outstanding, beginning (in dollars per share) $ 16.53 $ 18.27 $ 25.20
Granted (in dollars per share) $ 20.45 $ 11.18 $ 5.30
Exercised (in dollars per share) $ 15.22 $ 13.36 $ 3.59
Forfeited (in dollars per share) $ 26.66 $ 27.17 $ 25.68
Outstanding, ending (in dollars per share) $ 16.66 $ 16.53 $ 18.27
Exercisable (in dollars per share) $ 20.32 $ 25.73 $ 29.49
Weighted Average Remaining Contractual Term [Abstract]      
Outstanding (in years) 6.5    
Exercisable (in years) 5.4    
Aggregate Intrinsic Value [Abstract]      
Exercised $ 3,489,000    
Outstanding 51,535,000    
Exercisable 23,840,000    
Risk-free interest rate (in hundredths) 2.50% 2.80% 2.30%
Dividend yield (in hundredths) 0.20% 0.70% 1.90%
Volatility factor (in hundredths) 53.70% 53.00% 72.30%
Weighted average expected life, minimum (in years) 5.2 5.8 5.7
Weighted average expected life, maximum (in years) 6.7 6.6 6.3
Share-based compensation expense 11,900,000 13,000,000 8,400,000
Stock Options and SARs Awarded Prior to 2006 [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of grantee plus grantees total number of years of service 65 or more    
SARs Granted in 2006 through April 2009 [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of grantee plus grantees total number of years of service 70 or more    
Age of grantee to receive awards even upon termination of employment (in years) 62Y    
SARs modified on May 2009 [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of grantee plus grantees total number of years of service 70 or more    
Age of grantee to receive awards even upon termination of employment (in years) 62Y    
Additional compensation expense due to modification of SAR awards 1,600,000    
Non-Vested Stock Awards [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Age of grantee plus grantees total number of years of service 70 or more    
Aggregate Intrinsic Value [Abstract]      
Share-based compensation expense 3,700,000 2,100,000 600,000
Awards vesting period, lower range (in years)   3Y  
Awards vesting period, upper range (in years)   4Y  
Weighted average price at grant date (in dollars per share) $ 21.02 $ 11.44 $ 10.71
Non-vested Stock Award Activity [Roll Forward]      
Outstanding, non-vested, beginning (in shares) 332,000 909,000 1,207,000
Granted (in shares) 237,000 275,000 20,000
Released (in shares) (16,000) (79,000) (168,000)
Forfeited (in shares) (12,000) (773,000) (150,000)
Outstanding, non-vested, ending (in shares) 541,000 332,000 909,000
Compensation cost not yet recognized $ 2,500,000