Fair value portion of assets classified as held for sale.

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Amount of realized and unrealized gain (loss) on investment.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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Amount of unrealized gain (loss) on investment.

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Number of Rabbit Trusts established.

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FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
FAIR VALUE MEASUREMENTS (Narrative) (Details) $ in Millions	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item	Sep. 30, 2022 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of Rabbi Trusts established \| item			2
Net gains (losses) of the Rabbi Trust investments			$ 0.5	$ (8.1)
Unrealized net gains (losses) of the Rabbi Trusts' investments			0.6	(8.3)
Asset Held For Sale [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loss from assets held for sale impairment	$ 28.3	$ 16.9
Reported Value Measurement [Member] \| Asset Held For Sale [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets held for sale, estimated fair value	513.3	196.9	513.3	196.9
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Asset Held For Sale [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets held for sale, estimated fair value	$ 485.0	$ 180.0	$ 485.0	$ 180.0