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FAIR VALUE MEASUREMENTS - Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Carrying Amount    
Carrying amount and fair value of financial instruments    
Long-term debt, including current maturities $ 8,064.1 $ 7,561.3
Fair Value | Level 2    
Carrying amount and fair value of financial instruments    
Long-term debt, including current maturities $ 7,356.7 $ 6,662.1