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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Carrying amount    
Fair value of financial instruments    
Long-term debt, including current portion $ 1,659.3 $ 1,613.5
Finance lease obligations 31.3 31.3
Fair value    
Fair value of financial instruments    
Long-term debt, including current portion 1,903.2 1,935.9
Long-term debt, including current portion $ 1,659.3 $ 1,613.5