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Segment Information (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Geographic Information
Operating revenues	$ 481.7	$ 443.8	$ 941.8	$ 873.7
Long-lived assets	1,733.5		1,733.5		$ 1,770.9
U.S.
Geographic Information
Operating revenues	272.6	$ 257.4	542.9	$ 529.4
Long-lived assets	$ 987.8		$ 987.8		1,006.1
Foreign
Geographic Information
Percent of foreign revenue from Canada	53.00%	52.00%	53.00%	53.00%
Operating revenues	$ 209.1	$ 186.4	$ 398.9	$ 344.3
Long-lived assets	$ 745.7		$ 745.7		$ 764.8

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