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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mar. 12, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash proceeds $ 48.0        
Acquisition of non-controlling interest   $ 48.6 $ 0.0    
Redeemable non-controlling interest   0.0   $ 43.7  
Debt, fair value   $ 1,954.2   2,199.2  
Island Offshore Management AS          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value       $ 43.7  
TIOS AS | Island Offshore Management AS          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners       51.00%  
TIOS AS | Island Offshore Management AS | Share Purchase Agreement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Purchased shares (percentage)         51.00%
Remaining interest (percentage)   49.00%