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Self Insurance and Retained Loss Reserves (Tables)
 12 Months Ended
Dec. 31, 2023
Self Insurance and Retained Loss Reserves [Abstract]  
Summary of the changes in the reserves for self-insurance and the retained losses
The following is a summary of the changes in the reserves for self-insurance and the retained losses (in millions):
 Year Ended December 31,
 202320222021
Balance at beginning of period$12.5 $10.4 $10.0 
Net payments(33.7)(27.8)(33.5)
Expense28.4 29.9 33.9 
Balance at end of period$7.2 $12.5 $10.4