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Self Insurance and Retained Loss Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in the reserves for self-insurance and the retained losses      
Balance at beginning of period $ 12.5 $ 10.4 $ 10.0
Net payments (33.7) (27.8) (33.5)
Expense 28.4 29.9 33.9
Balance at end of period 7.2 12.5 10.4
Individual stop-loss coverage for medical benefits 0.5 0.5 0.5
Retention for automobile and general liability claims 1.0 1.0 1.0
Retention for workers compensation claims 0.5 0.5 0.5
Corridor deductible for workers compensation claims 1.0 1.0 1.0
Deductible amount per occurrence after corridor deductible is met 0.5 0.5 0.5
Aggregate retention for workers compensation, automobile and garage liability   28.5 28.5
Insurance payments after aggregate retention is met up to specified amount   $ 7.5 $ 7.5
Aggregate limit for general liability primary policy $ 3.0