Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES (Narrative) (Details)

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DEBT AND CREDIT FACILITIES (Narrative) (Details) - USD ($)
 3 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
$1,075 Million 5.75% 2025 Senior Notes [Member]        
Line of Credit Facility [Line Items]        
Proceeds from Issuance of Debt $ 575,000,000 $ 500,000,000    
Debt Instrument, Interest Rate, Stated Percentage     5.75%  
Debt issuance, discount rate     97.00%  
Debt Instrument, Par Value     $ 1,075,000,000 $ 1,075,000,000
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Par Value     450,000,000 550,000,000
U.S. Tranche     400,000,000  
Sublimit for Issuers of Letters of Credit for U.S. Tranche     248,800,000  
Sublimit for U.S. Swingline Loans     100,000,000  
Australian Tranche     50,000,000  
Sublimit for Issuance of Letters of Credit for Australian Tranche     24,400,000  
Sublimit for Australian Swingline Loans     20,000,000  
Credit facility, amount outstanding     0 0
Line of Credit Facility, Maximum Borrowing Capacity     314,100,000 273,200,000
Letters of credit outstanding     46,600,000 46,500,000
Credit facility remaining capacity     $ 267,500,000 $ 226,700,000