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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.2

 
$
0.3

 
$
0.4

 
$
0.8

Interest
5.1

 
4.6

 
15.1

 
13.9

Expected return on plan assets
(7.8
)
 
(6.6
)
 
(23.2
)
 
(19.9
)
Amortization of actuarial loss
1.0

 
1.2

 
1.6

 
3.7

Defined benefit expense
(1.5
)
 
(0.5
)
 
(6.1
)
 
(1.5
)
Profit sharing
3.9

 
3.1

 
12.8

 
9.5

Multiemployer plan
0.3

 
—

 
0.3

 
—

Net expense
$
2.7

 
$
2.6

 
$
7.0

 
$
8.0



Trinity contributed $4.1 million and $11.7 million to the Company's defined benefit pension plans for the three and nine months ended September 30, 2014, respectively. 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. Total contributions to the Company's defined benefit pension plans in 2014 are expected to be approximately $15.0 million. With the acquisition of Meyer, the Company participates in a multiemployer defined benefit plan under the terms of a collective-bargaining agreement that covers certain union-represented employees. The Company's contributions to this plan for 2014 are expected to total approximately $0.8 million.