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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2015
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
June 30,
 
Six Months Ended
June 30,
 
2015
 
2014
 
2015
 
2014
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Defined benefit:
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Interest
5.0

 
5.0

 
10.0

 
10.0

Expected return on plan assets
(7.6
)
 
(7.7
)
 
(15.2
)
 
(15.4
)
Amortization of actuarial loss
1.3

 
0.3

 
2.6

 
0.6


(1.2
)
 
(2.3
)
 
(2.4
)
 
(4.6
)
Profit sharing
5.1

 
5.2

 
10.4

 
8.9

Multiemployer plan
0.5

 
—

 
1.1

 
—

Net retirement cost
$
4.4

 
$
2.9

 
$
9.1

 
$
4.3



Trinity contributed $4.7 million and $8.1 million to the Company's defined benefit pension plans for the three and six months ended June 30, 2015, respectively. Trinity contributed $3.5 million and $7.6 million to the Company's defined benefit pension plans for the three and six months ended June 30, 2014, respectively. Total contributions to the Company's defined benefit pension plans in 2015 are expected to be approximately $19.7 million. 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 contributed $0.6 million and $1.3 million to the multiemployer plan for the three and six months ended June 30, 2015, respectively. Total contributions to this plan for 2015 are expected to be approximately $2.0 million.