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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% |

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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