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Employee Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Retirement plan expense
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