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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross long-term debt		$ 3,391.1	$ 3,941.5	$ 3,941.6
Cash flow hedges		(18.2)	(19.4)	(19.8)
Interest Rate Swap
Derivative [Line Items]
Notional amount of interest rate swap agreements					$ 550.0
Fixed interest rate under swap agreements (as percent)					5.80%
Interest rate spread above SOFR (as percent)					0.241%
Interest Rate Swap | Designated as Hedging Instrument | Cash Flow Hedges | Forecast
Derivative [Line Items]
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period	$ 2.3
Commercial Paper
Derivative [Line Items]
Gross long-term debt		550.0	550.0	550.0		$ 550.0
Notes | 5.80% Notes due 2026
Derivative [Line Items]
Gross long-term debt		$ 0.0	$ 550.0	$ 550.0	$ 550.0
Interest rate (as percent)		5.80%			5.80%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
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- Definition

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.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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

+ References

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Fixed interest rate related to the interest rate derivative.

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- Definition

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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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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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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