Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Employee Benefit Plans (Details 6)

v2.4.0.6
Share-Based Compensation and Employee Benefit Plans (Details 6) (Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member], Management, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Management
   
Deferred Compensation Plan    
Maximum percentage of participants' compensation which is deferrable (as a percent) 100.00%  
Balance of the plan which was fully funded $ 6.8 $ 7.6