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LONG-TERM DEBT AND CREDIT FACILITIES - Changes in liabilities arising from financing activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Changes in liabilities arising from financing activities    
Balance at the beginning $ 2,296.5 $ 2,682.4
Debt issuance and drawdowns   588.1
Debt repayments (800.0) (960.0)
Interest paid (35.6) (53.2)
Payment of lease liabilities (12.1) (30.2)
Changes from financing cash flows 1,448.8 2,227.1
Other changes    
Interest expense and accretion 50.5 69.0
Capitalized interest 88.2 108.9
Capitalized interest paid (92.6) (114.1)
Additions of lease liabilities 1.9 7.9
Other (13.2) (2.3)
Other changes 34.8 69.4
Balance at the end 1,483.6 2,296.5
Longterm Borrowings [Member]    
Changes in liabilities arising from financing activities    
Balance at the beginning 2,232.6 2,592.9
Debt issuance and drawdowns   588.1
Debt repayments (800.0) (960.0)
Changes from financing cash flows 1,432.6 2,221.0
Other changes    
Other 2.8 11.6
Other changes 2.8 11.6
Balance at the end 1,435.4 2,232.6
Lease liabilities    
Changes in liabilities arising from financing activities    
Balance at the beginning 27.6 47.6
Payment of lease liabilities (12.1) (30.2)
Changes from financing cash flows 15.5 17.4
Other changes    
Interest expense and accretion 1.4 2.1
Additions of lease liabilities 1.9 7.9
Other (1.7) 0.2
Other changes 1.6 10.2
Balance at the end 17.1 27.6
Accrued interest payable    
Changes in liabilities arising from financing activities    
Balance at the beginning 36.3 41.9
Interest paid (35.6) (53.2)
Changes from financing cash flows 0.7 (11.3)
Other changes    
Interest expense and accretion 49.1 66.9
Capitalized interest 88.2 108.9
Capitalized interest paid (92.6) (114.1)
Other (14.3) (14.1)
Other changes 30.4 47.6
Balance at the end $ 31.1 $ 36.3