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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, 2022
Dec. 31, 2021
Changes in liabilities arising from financing activities    
Balance at the beginning $ 1,710.0 $ 2,032.3
Debt issued 1,297.6 200.0
Debt repayments (340.0) (500.0)
Interest paid (52.4) (46.9)
Payment of lease liabilities (23.2) (33.8)
Changes from financing cash flows 2,592.0 1,651.6
Other changes    
Interest expense and accretion 68.2 71.5
Capitalized interest 66.5 48.3
Capitalized interest paid (43.7) (51.1)
Additions of lease liabilities 14.8 10.2
Other (15.4) (20.5)
Other changes 90.4 58.4
Balance at the end 2,682.4 1,710.0
Long-term debt    
Changes in liabilities arising from financing activities    
Balance at the beginning 1,629.9 1,923.9
Debt issued 1,297.6 200.0
Debt repayments (340.0) (500.0)
Changes from financing cash flows 2,587.5 1,623.9
Other changes    
Other 5.4 6.0
Other changes 5.4 6.0
Balance at the end 2,592.9 1,629.9
Lease liabilities    
Changes in liabilities arising from financing activities    
Balance at the beginning 54.8 74.7
Payment of lease liabilities (23.2) (33.8)
Changes from financing cash flows 31.6 40.9
Other changes    
Interest expense and accretion 2.6 3.8
Additions of lease liabilities 14.8 10.2
Other (1.4) (0.1)
Other changes 16.0 13.9
Balance at the end 47.6 54.8
Accrued interest payable    
Changes in liabilities arising from financing activities    
Balance at the beginning 25.3 33.7
Interest paid (52.4) (46.9)
Changes from financing cash flows (27.1) (13.2)
Other changes    
Interest expense and accretion 65.6 67.7
Capitalized interest 66.5 48.3
Capitalized interest paid (43.7) (51.1)
Other (19.4) (26.4)
Other changes 69.0 38.5
Balance at the end $ 41.9 $ 25.3