Quarterly report pursuant to Section 13 or 15(d)

Share Based Compensation (Details Textual)

v2.4.0.8
Share Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Share Based Compensation (Textuals) [Abstract]      
Total fair value of awards vested $ 25.1 $ 14.8  
Share Based Compensation (Additional Textuals) [Abstract]      
Cash received for exercises of stock options 16.7    
Tax benefit realized from stock option exercises 2.4 1.3  
Exercise of stock option     2,799,000
Award vested as of grant date     100.00%
Granted, weighted average grant date fair value per share $ 9.14 $ 7.12  
Total unrecognized compensation cost related to nonvested awards $ 71.3   $ 71.3
Weighted-average expense recognition period 2 years 8 months    
Common stock available for future grants 14,900,000   14,900,000
After May 2004 [Member]
     
Share Based Compensation (Textuals) [Abstract]      
Options granted, term     P7Y
Prior to May 2004 [Member]
     
Share Based Compensation (Textuals) [Abstract]      
Options granted, term     P10Y
Restricted stock awards [Member]
     
Share Based Compensation (Additional Textuals) [Abstract]      
Granted, weighted average grant date fair value per share     $ 0