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Segment Information (Details 2) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Geographic Information    
Operating revenues $ 416.3 $ 420.6
U.S.    
Geographic Information    
Operating revenues $ 258.5 $ 272.2
Foreign    
Geographic Information    
Percent of foreign revenue from Canada 54.00% 60.00%
Operating revenues $ 157.8 $ 148.4