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CONTRACTUAL RIGHTS AND OBLIGATIONS - Reconciliation of liabilities arising from financing activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Opening balance $ 749.6 $ 749.1
Cash - Borrowings 261.8 114.5
Cash - Repayments (169.2) (113.7)
Cash - Other changes 13.2 (0.3)
End balance 855.4 749.6
Borrowings    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Opening balance 749.6  
Cash - Borrowings 261.8  
Cash - Repayments (169.2)  
Cash - Other changes 13.2  
End balance $ 855.4 $ 749.6