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Segment Information (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Geographic Information        
Operating revenues $ 416.3 $ 393.0 $ 1,253.8 $ 1,146.6
U.S.        
Geographic Information        
Operating revenues $ 259.0 $ 264.3 $ 781.8 $ 744.1
Foreign        
Geographic Information        
Percent of foreign revenue from Canada 58.00% 60.00% 60.00% 63.00%
Operating revenues $ 157.3 $ 128.7 $ 472.0 $ 402.5