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Segment Information (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Geographic Information
Operating revenues	$ 416.3	$ 420.6
U.S.
Geographic Information
Operating revenues	$ 258.5	$ 272.2
Foreign
Geographic Information
Percent of foreign revenue from Canada	54.00%	60.00%
Operating revenues	$ 157.8	$ 148.4

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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