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COMMITMENTS - Commitments – Payments due by Period (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Commitments [Line Items]    
Purchase obligations $ 99.6 $ 120.3
Capital expenditure obligations 426.2 400.6
Lease obligations 80.3 72.4
Contractual Obligation 606.1 $ 593.3
2022    
Disclosure Of Commitments [Line Items]    
Purchase obligations 83.7  
Capital expenditure obligations 348.9  
Lease obligations 26.3  
Contractual Obligation 458.9  
Later than one year and not later than three years    
Disclosure Of Commitments [Line Items]    
Purchase obligations 4.3  
Capital expenditure obligations 76.9  
Lease obligations 36.5  
Contractual Obligation 117.7  
Later than three years and not later than five years    
Disclosure Of Commitments [Line Items]    
Purchase obligations 5.3  
Capital expenditure obligations 0.4  
Lease obligations 9.7  
Contractual Obligation 15.4  
2027 onwards    
Disclosure Of Commitments [Line Items]    
Purchase obligations 6.3  
Capital expenditure obligations 0.0  
Lease obligations 7.8  
Contractual Obligation $ 14.1