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 9 Months Ended
Oct. 05, 2018
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]                
Gain (loss) on extinguishment of debt   $ 0 $ (88,600,000)   $ 200,000 $ (165,400,000)    
Payments for Repurchase of Senior Notes Debt         $ 16,300,000 $ 1,720,700,000    
$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   368,400,000     368,400,000     273,200,000
Letters of credit outstanding   37,700,000     37,700,000     46,500,000
Credit facility remaining capacity   330,700,000     330,700,000     $ 226,700,000
Debt Repurchase [Member]                
Line of Credit Facility [Line Items]                
Extinguishment of Debt, Amount   1,000,000     16,500,000      
Debt Repurchase [Member] | $1,075 Million 5.75% 2025 Senior Notes [Member]                
Line of Credit Facility [Line Items]                
Extinguishment of Debt, Amount   $ 0     $ 1,700,000      
Subsequent Event [Member]                
Line of Credit Facility [Line Items]                
Extinguishment of Debt, Amount $ 211,000,000              
Payments for Repurchase of Senior Notes Debt $ 218,000,000