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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Employee Retirement Plans
Employee Retirement Plans

The following table summarizes the components of net retirement cost for the Company:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.3

 
$
0.2

 
$
0.8

 
$
0.6

Interest
4.6

 
4.9

 
13.9

 
14.6

Expected return on plan assets
(6.6
)
 
(5.7
)
 
(19.9
)
 
(17.1
)
Amortization of actuarial loss
1.2

 
0.7

 
3.7

 
2.5

Prior service cost
—

 
0.1

 
—

 
0.1

Defined benefit expense
(0.5
)
 
0.2

 
(1.5
)
 
0.7

Profit sharing
3.1

 
3.1

 
9.5

 
8.9

Net expense
$
2.6

 
$
3.3

 
$
8.0

 
$
9.6



Trinity contributed $6.7 million and $14.8 million to the Company's defined benefit pension plans for the three and nine months ended September 30, 2013, respectively. Trinity contributed $3.6 million and $13.8 million to the Company's defined benefit pension plans for the three and nine months ended September 30, 2012, respectively. Total contributions to the Company's defined benefit pension plans in 2013 are expected to be approximately $18.9 million.