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Employee Retirement Plans
 3 Months Ended
Mar. 31, 2025
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,
20252024
(in millions)
Defined contribution plans$4.4 $4.0 
Multiemployer plans0.5 0.4 
$4.9 $4.4 
The Company contributes to various multiemployer defined benefit pension plans under the terms of collective-bargaining agreements that cover certain union-represented employees at one of the facilities in our Engineered Structures segment and four of the facilities in our Construction Products segment acquired in the Stavola acquisition. The Company contributed $0.5 million and $0.4 million to the multiemployer plans for the three months ended March 31, 2025 and 2024, respectively. Total contributions to these plans for 2025 are expected to be approximately $2.9 million.