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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
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 | 20,629.8 | 20,017.5
Fair value |  |
Financial instruments |  |
Preferred stock of subsidiary | 21.3 | 21.2
Long-term debt, including current portion | $ 20,140.2 | $ 19,609.1

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