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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

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