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FAIR VALUE MEASUREMENTS - Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Carrying Amount    
Carrying amount and fair value of financial instruments    
Long-term debt, including current maturities $ 8,269.7 $ 8,349.7
Fair Value | Level 2    
Carrying amount and fair value of financial instruments    
Long-term debt, including current maturities $ 8,274.2 $ 9,085.3