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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share Based Compensation (Textuals) [Abstract]        
Total fair value of awards vested $ 9.9 $ 3.1      
Share Based Compensation (Additional Textuals) [Abstract]        
Cash received for exercises of stock options 9.6        
Tax benefit realized from stock option exercises 1.2 0.7      
Exercise of stock option     1,632,000  
Award vested as of grant date     100.00%  
Granted, weighted average grant date fair value per share $ 9.13 $ 7.10      
Total unrecognized compensation cost related to nonvested awards $ 85.1   $ 85.1  
Weighted-average expense recognition period 2 years 8 months      
Common stock available for future grants 14,400,000   14,400,000  
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