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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
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 | 16,835.4 | 15,464.2
Finance lease obligations | 150.4 | 183.2
Fair value |  |
Financial instruments |  |
Preferred stock of subsidiary | 22.8 | 22.7
Long-term debt, including current portion | $ 15,366.6 | $ 13,921.3

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