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Employee Retirement Plans
9 Months Ended
Sep. 30, 2011
Employee Retirement Plans [Abstract] 
Employee Retirement Plans
Note 14. Employee Retirement Plans
     The following table summarizes the components of net retirement cost for the Company.
                                 
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2011   2010   2011   2010
            (in millions)        
Service cost
  $ 0.2     $ 0.2     $ 0.7     $ 0.7  
Interest
    4.9       4.4       14.7       14.2  
Expected return on plan assets
    (5.7 )     (5.0 )     (17.1 )     (15.0 )
Actuarial loss
    0.4       0.4       1.4       1.6  
Prior service cost
    0.1             0.1        
Profit sharing
    1.9       2.0       6.4       6.3  
 
                       
Net expense
  $ 1.8     $ 2.0     $ 6.2     $ 7.8  
 
                       
     Trinity contributed $2.9 million and $11.7 million to the Company’s defined benefit pension plans for the three and nine month periods ended September 30, 2011, respectively. Trinity contributed $3.4 million and $10.1 million to the Company’s defined benefit pension plans for the three and nine month periods ended September 30, 2010, respectively. Total contributions to the Company’s pension plans in 2011 are expected to be approximately $15.2 million.