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DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Debt Instrument Redemption) (Details) - $750 Million 5.875% 2027 Senior Notes [Member]
6 Months Ended
Jun. 30, 2019
Debt Instrument, Redemption, Period One, Upon Equity Issuance [Member]  
Debt Instrument, Redemption [Line Items]  
Debt Instrument, Redemption Price, Percentage 105.875%
Debt Instrument, Redemption, Period One, Including Premium [Member]  
Debt Instrument, Redemption [Line Items]  
Debt Instrument, Redemption Price, Percentage 100.00%
Debt Instrument, Redemption, Period Two [Member]  
Debt Instrument, Redemption [Line Items]  
Debt Instrument, Redemption Price, Percentage 102.938%
Debt Instrument, Redemption, Period Three [Member]  
Debt Instrument, Redemption [Line Items]  
Debt Instrument, Redemption Price, Percentage 101.958%
Debt Instrument, Redemption, Period Four [Member]  
Debt Instrument, Redemption [Line Items]  
Debt Instrument, Redemption Price, Percentage 100.979%
Debt Instrument, Redemption, Period Five [Member]  
Debt Instrument, Redemption [Line Items]  
Debt Instrument, Redemption Price, Percentage 100.00%