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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial instruments |  |
Preferred stock of subsidiary | $ 30.4 | $ 30.4
Carrying amount |  |
Financial instruments |  |
Preferred stock of subsidiary | 30.4 | 30.4
Long-term debt, including current portion | 19,564.7 | 18,907.1
Fair value |  |
Financial instruments |  |
Preferred stock of subsidiary | 22.2 | 21.2
Long-term debt, including current portion | $ 19,248.1 | $ 17,840.8

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