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Segment Information (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Geographic Information        
Operating revenues $ 448.4 $ 416.3 $ 1,296.5 $ 1,253.8
U.S.        
Geographic Information        
Operating revenues $ 251.9 $ 259.0 $ 755.7 $ 781.8
Foreign        
Geographic Information        
Percent of foreign revenue from Canada 51.00% 58.00% 53.00% 60.00%
Operating revenues $ 196.5 $ 157.3 $ 540.8 $ 472.0