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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, 2018
Dec. 31, 2017
LONG-TERM DEBT AND CREDIT FACILITIES    
Liabilities arising from financing activities at beginning of period $ 1,766.4 $ 1,756.6
Changes from financing cash flows    
Debt issued 80.0 494.7
Debt repayments (80.0) (500.0)
Interest paid (57.9) (62.9)
Other changes    
Interest expense 72.1 86.5
Capitalized interest 41.5 25.1
Capitalized interest paid (38.2) (18.0)
Other cash changes (9.9) (12.0)
Other non cash changes (5.7) (3.6)
Liabilities arising from financing activities at end of period 1,768.3 1,766.4
Long-term debt    
LONG-TERM DEBT AND CREDIT FACILITIES    
Liabilities arising from financing activities at beginning of period 1,732.6 1,733.2
Changes from financing cash flows    
Debt issued 80.0 494.7
Debt repayments (80.0) (500.0)
Other changes    
Other non cash changes 2.4 4.7
Liabilities arising from financing activities at end of period 1,735.0 1,732.6
Accrued interest payable    
LONG-TERM DEBT AND CREDIT FACILITIES    
Liabilities arising from financing activities at beginning of period 33.8 23.4
Changes from financing cash flows    
Interest paid (57.9) (62.9)
Other changes    
Interest expense 72.1 86.5
Capitalized interest 41.5 25.1
Capitalized interest paid (38.2) (18.0)
Other cash changes (9.9) (12.0)
Other non cash changes (8.1) (8.3)
Liabilities arising from financing activities at end of period $ 33.3 $ 33.8