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PROVISIONS - Asset Retirement Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in other provisions [abstract]    
Balance, beginning of the year $ 394.7  
Balance, end of the year 476.7 $ 394.7
Less current portion (6.5) (6.7)
Non-current portion 470.2 388.0
Asset retirement obligations    
Reconciliation of changes in other provisions [abstract]    
Balance, beginning of the year 380.0 368.4
Revision of estimated cash flows and discount rates: Capitalized in property, plant and equipment 42.0 7.6
Revision of estimated cash flows and discount rates: Changes in asset retirement obligations at closed sites 40.7 6.1
Accretion expense 0.0 0.1
Disbursements (2.3) (2.2)
Balance, end of the year 460.4 380.0
Less current portion (6.5) (6.7)
Non-current portion $ 453.9 $ 373.3