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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