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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Mar. 31, 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 18,891.7 18,907.1
Fair value    
Financial instruments    
Preferred stock of subsidiary 21.8 21.2
Long-term debt, including current portion $ 18,271.9 $ 17,840.8