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ACQUISITIONS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 03, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Business Acquisition [Line Items]          
Pro forma revenue   $ 481.3 $ 409.9 $ 906.2 $ 749.9
Pro forma net income   17.7 $ 36.0 30.9 $ 29.4
SJ Transportation          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Total consideration transferred $ 19.3        
Goodwill 8.1 8.1   8.1  
Transaction expenses $ 0.2        
Pro forma revenue   6.8   8.7  
Pro forma net income   $ 0.6   $ 0.7