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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023
--- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |
Gross long-term debt |  | $ 3,391.1 | $ 3,941.5 | $ 3,941.6 |
Cash flow hedges |  | (18.6) | (19.4) | (20.2) |
5.80% notes due 2026 | Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gross long-term debt |  | $ 0.0 | $ 550.0 | $ 550.0 | $ 550.0
Interest rate |  | 5.80% |  |  | 5.80%
Interest rate swaps |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of interest rate swap agreements |  |  |  |  | $ 550.0
Fixed interest rate under swap agreements |  |  |  |  | 5.80%
Interest rate spread above SOFR |  |  |  |  | 0.241%
Designated As Hedging Instrument | Cash Flow Hedges | Interest rate swaps | Forecast |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Estimated amount of pretax loss in AOCI reclassified to earnings for the next 12-month period | $ 2.3 |  |  |  |

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- 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 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-2 + Details
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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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
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