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Business Combinations Asset Acquisition - Assets and Liabilties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 01, 2023
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2024
Dec. 31, 2023
Business Acquisition          
Goodwill       $ 331.7 $ 331.7
M&M Transport Services, Inc.          
Business Acquisition          
Goodwill       $ 103.5  
Date of acquisition Aug. 01, 2023        
Percentage of business acquired 100.00%        
Fair value of consideration transferred $ 243.8        
Pro forma operating revenues   $ 1,361.6 $ 4,197.8