Amount, after tax, of accumulated gain (loss) from increase (decrease) in value of excluded component of derivative hedge.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fixed interest rate related to the interest rate derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Derivative [Line Items]
Gross long-term debt		$ 3,941.6	$ 3,941.9	$ 3,941.9
Cash flow hedges		(20.2)	$ (21.0)	$ (21.8)
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements	$ 550.0
Interest rate spread above SOFR	0.241%
Fixed interest rate under swap agreements	5.80%
Gross long-term debt	$ 550.0
Fixed Rate Debt [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements	$ 550.0
Fixed interest rate under swap agreements	5.80%
Derivative, maturity date	Mar. 01, 2026
Designated As Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period		$ (2.2)