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DEBT - Narrative (Details) - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2018
Apr. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Oct. 31, 2013
Debt Instrument [Line Items]            
Proceeds from issuance of debt, net (Note 6)     $ 686,400,000 $ 989,300,000    
Total senior notes            
Debt Instrument [Line Items]            
Debt issuance costs     $ 1,400,000   $ 500,000  
Redemption price (percentage)     101.00%      
Total senior notes | Fixed-rate 2.875% 2013 Notes            
Debt Instrument [Line Items]            
Face value of debt           $ 600,000,000
Total senior notes | Fixed-rate 4.300% 2018 Notes            
Debt Instrument [Line Items]            
Face value of debt $ 600,000,000.0          
Proceeds from issuance of debt, net (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