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OPERATING REVENUES - Revenue Recognition (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Accounts receivable
Disaggregation of operating revenue
Due from contracts with customers	$ 19.3	$ 23.5

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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