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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DERIVATIVE INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period		$ 2.2
Gross long-term debt		3,941.5	$ 3,941.9
Cash flow hedges		$ (19.4)	$ (21.0)	$ (22.5)
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount of interest rate swap agreements	$ 550.0
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
SOFR [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Interest rate spread above SOFR	0.241%