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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Share-Based Compensation (Textual) [Abstract]          
Share-based compensation expense $ 5.3 $ 5.5 $ 12.5 $ 11.1  
Unrecognized compensation cost on nonvested stock awards 67.4   67.4    
Unrecognized compensation cost on nonvested stock awards, weighted-average period of recognition     1 year 9 months 18 days    
Outstanding market and performance condition SARs 405,800   405,800   717,600
Outstanding and exercisable market condition SARs 5,763,000   5,763,000    
Weighted-average grant date fair value of SARs granted     $ 15.36 $ 21.22  
Total intrinsic value of awards exercised for options and SARs 24.7 47.1 94.3 64.0  
Share Based Compensation (Additional Textual) [Abstract]          
Excess tax benefit 27.1   27.1   20.6
Total vesting date fair value of stock units $ 4.5 $ 4.3 $ 23.0 $ 17.9  
Market Condition Awards [Member]
         
Share-Based Compensation (Textual) [Abstract]          
Outstanding market and performance condition SARs 1,500,000   1,500,000   1,500,000
Outstanding and exercisable market condition SARs 1,500,000   1,500,000    
Market and Performance Condition Awards [Member]
         
Share-Based Compensation (Textual) [Abstract]          
Outstanding market and performance condition SARs 900,000   900,000   900,000
SARs [Member]
         
Share-Based Compensation (Textual) [Abstract]          
Weighted-average grant date fair value of SARs granted $ 15.27 $ 21.42