U.K. Pension Plan (Tables)
9 Months Ended
Sep. 30, 2011
Compensation and Retirement Disclosure [Abstract] 
Net periodic benefit expense
The components of net periodic benefit cost, excluding the transfer discussed below, for the three and nine months ended September 30, 2011 and 2010 are as follows (in millions):

   
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
   
2011
  
2010
  
2011
  
2010
 
Service cost for benefits earned during the year
 $-  $-  $-  $- 
Interest cost on projected benefit obligation
  1.0   1.0   2.9   2.9 
Expected return on plan assets
  (0.9)  (0.9)  (2.7)  (2.7)
Net amortization
  0.5   0.5   1.5   1.5 
Net pension expense
 $0.6  $0.6  $1.7  $1.7