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 6 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]                
Gain (loss) on extinguishment of debt $ 200,000   $ (4,900,000)   $ 200,000 $ (76,800,000)    
$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%       5.75%      
Debt issuance, discount rate 97.00%       97.00%      
Debt Instrument, Par Value $ 1,073,300,000       $ 1,073,300,000     $ 1,075,000,000
Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Par Value 450,000,000       450,000,000   $ 450,000,000 550,000,000
U.S. Tranche 450,000,000       450,000,000   400,000,000  
Sublimit for Issuers of Letters of Credit for U.S. Tranche 273,200,000       273,200,000   248,800,000  
Sublimit for U.S. Swingline Loans 120,000,000       120,000,000   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     0
Line of Credit Facility, Maximum Borrowing Capacity 400,300,000       400,300,000     273,200,000
Letters of credit outstanding 39,500,000       39,500,000     46,500,000
Credit facility remaining capacity $ 360,800,000       $ 360,800,000     $ 226,700,000