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Employee Retirement Plans
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Employee Retirement Plans Employee Retirement Plans
Total employee retirement plan expense, which includes related administrative expenses, is as follows:
Three Months Ended
March 31,
20232022
(in millions)
Defined contribution plans$3.6 $3.2 
Multiemployer plan0.4 0.4 
$4.0 $3.6 
The Company contributes to a multiemployer defined benefit plan under the terms of a collective-bargaining agreement that covers certain union-represented employees at one of the facilities of Meyer Utility Structures, a subsidiary of Arcosa. The Company contributed $0.4 million to the multiemployer plan for the three months ended March 31, 2023 and 2022. Total contributions to the multiemployer plan for 2023 are expected to be approximately $1.5 million.