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Employee Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Retirement plan expense
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