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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
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 13,518.7 13,563.4
Finance lease obligations 179.1 129.7
Fair value    
Financial instruments    
Preferred stock of subsidiary 26.4 30.3
Long-term debt, including current portion $ 12,530.8 $ 14,819.4