Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation (Details Textual)

v2.4.0.6
Share-Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value of SARs granted       
Share-based compensation expense $ 7.2 $ 5.6  
Unrecognized compensation cost on nonvested stock awards 42.6    
Unrecognized compensation cost on nonvested stock awards, weighted-average period of recognition 1.8    
Outstanding market and performance condition SARs 415,500   717,600
Outstanding and exercisable market condition SARs 5,726,000    
Total intrinsic value of awards exercised for options and SARs 69.6 16.9  
Share-Based Compensation (Textual) [Abstract]      
Excess tax benefit 24.4   20.6
Total vesting date fair value of stock units $ 18.5 $ 13.6  
Market Condition Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding market and performance condition SARs 1,500,000   1,500,000
Outstanding and exercisable market condition SARs 1,500,000    
Market and Performance Condition Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding market and performance condition SARs 900,000   900,000
SARs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value of SARs granted $ 25.23 $ 15.23