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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Carrying value
Fair value of financial instruments
Cash and cash equivalents	$ 92.7	$ 266.8
CCF - Cash and cash equivalent	376.7	230.7
CCF - Investments	251.2	411.9
Fixed rate debt	370.9	400.9
Fair Value Measurement
Fair value of financial instruments
Cash and cash equivalents	92.7	266.8
CCF - Cash and cash equivalent	376.7	230.7
CCF - Investments	252.2	412.5
Fixed rate debt	302.0	317.7
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)
Fair value of financial instruments
Cash and cash equivalents	92.7	266.8
CCF - Cash and cash equivalent	376.7	230.7
CCF - Investments	252.2	412.5
Fair Value Measurement | Significant Observable Inputs (Level 2)
Fair value of financial instruments
Fixed rate debt	$ 302.0	$ 317.7

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions for the capital construction fund. Includes other kinds of accounts that have the general characteristics of demand deposits.

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Fair value portion of investment securities in the capital construction fund, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method

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