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Segment Information (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Geographic Information                      
Operating revenues $ 391.3 $ 416.3 $ 416.9 $ 420.6 $ 372.8 $ 393.0 $ 384.2 $ 369.4 $ 1,645.1 $ 1,519.4 $ 1,450.6
Long-lived assets 1,884.4       2,097.4       $ 1,884.4 2,097.4  
Disclosure of major customers                 No single customer accounted for more than ten percent of our total revenues in any fiscal year presented.    
U.S.                      
Geographic Information                      
Operating revenues                 $ 1,026.1 992.9 $ 847.9
Long-lived assets 1,074.2       1,787.4       $ 1,074.2 $ 1,787.4  
Foreign                      
Geographic Information                      
Percent of foreign revenue from Canada                 58.00% 62.00% 56.00%
Operating revenues                 $ 619.0 $ 526.5 $ 602.7
Long-lived assets $ 810.2       $ 310.0       $ 810.2 $ 310.0