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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [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,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Expense Components
 
 
 
 
 
 
 
Service cost
$
0.1

 
$
0.1

 
$
0.1

 
$
0.2

Interest
4.6

 
4.9

 
9.1

 
9.8

Expected return on plan assets
(6.9
)
 
(6.8
)
 
(13.7
)
 
(13.6
)
Amortization of actuarial loss
1.1

 
1.2

 
2.3

 
2.4

Defined benefit expense
(1.1
)
 
(0.6
)
 
(2.2
)
 
(1.2
)
Profit sharing
4.4

 
3.8

 
8.8

 
7.8

Multiemployer plan
0.5

 
0.4

 
1.1

 
1.0

Net expense
$
3.8

 
$
3.6

 
$
7.7

 
$
7.6


Trinity contributed $3.0 million and $3.7 million to the Company's defined benefit pension plans for the three and six months ended June 30, 2018, respectively. Trinity contributed $0.9 million and $0.9 million to the Company's defined benefit pension plans for the three and six months ended June 30, 2017, respectively. Total contributions to the Company's defined benefit pension plans in 2018 are expected to be approximately $18.4 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 $0.5 million and $1.1 million to the multiemployer plan for the three and six months ended June 30, 2018, respectively. The Company contributed $0.3 million and $0.9 million to the multiemployer plan for the three and six months ended June 30, 2017, respectively. Total contributions to the multiemployer plan for 2018 are expected to be approximately $2.3 million.