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Employee Retirement Plans
 3 Months Ended
Mar. 31, 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
March 31,
 
2018
 
2017
 
(in millions)
Expense Components
 
 
 
Service cost
$
—

 
$
0.1

Interest
4.5

 
4.9

Expected return on plan assets
(6.8
)
 
(6.8
)
Amortization of actuarial loss
1.2

 
1.2

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

 
4.0

Multiemployer plan
0.6

 
0.6

Net expense
$
3.9

 
$
4.0


Trinity contributed $0.7 million to the Company's defined benefit pension plans for the three months ended March 31, 2018. Contributions to the Company's defined benefit pension plans for the three months ended March 31, 2017 were not significant. 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 $0.6 million and $0.6 million to the multiemployer plan for the three months ended March 31, 2018 and 2017, respectively. Total contributions to the multiemployer plan for 2018 are expected to be approximately $2.5 million.