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DEBT - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended
Apr. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Oct. 31, 2013
Debt Instrument [Line Items]          
Proceeds from issuance of debt (Note 6)   $ 685,800,000 $ 985,400,000    
Total senior notes          
Debt Instrument [Line Items]          
Debt issuance costs   $ 1,600,000   $ 500,000  
Redemption price (percentage)   101.00%      
Total senior notes | Fixed-rate 2.875% notes          
Debt Instrument [Line Items]          
Face value of debt         $ 600,000,000
Total senior notes | Fixed-rate 4.300% notes          
Debt Instrument [Line Items]          
Face value of debt   $ 600,000,000.0      
Proceeds from issuance of debt (Note 6)   598,600,000      
Debt issuance costs   1,400,000      
Level 2 | Total senior notes          
Debt Instrument [Line Items]          
Fair value of debt   1,200,000,000   $ 604,300,000  
Credit Agreement Maturity April 2023 | Line of Credit          
Debt Instrument [Line Items]          
Debt instrument term 5 years        
Line of credit facility maximum borrowing capacity $ 750,000,000        
Gross debt issuance cost   2,400,000      
Long-term line of credit   $ 0      
Credit Agreement Maturity April 2023 | Line of Credit | Minimum          
Debt Instrument [Line Items]          
Line of credit commitment fee percentage 0.10%        
Credit Agreement Maturity April 2023 | Line of Credit | Maximum          
Debt Instrument [Line Items]          
Additional capacity increase option $ 250,000,000        
Line of credit commitment fee percentage 0.20%        
Credit Agreement Maturity April 2023 | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
Line of credit basis spread on variable rate 0.90%        
Credit Agreement Maturity April 2023 | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
Line of credit basis spread on variable rate 1.30%        
Credit Agreement, Maturity July 2019 | Line of Credit          
Debt Instrument [Line Items]          
Debt instrument term 5 years