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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
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 | 17,900.6 | 16,631.1
Finance lease obligations | 164.6 | 145.9
Fair value |  |
Financial instruments |  |
Preferred stock of subsidiary | 21.2 | 21.4
Long-term debt, including current portion | $ 16,632.6 | $ 15,564.3

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