Quarterly report pursuant to Section 13 or 15(d)

DEBT - Additional Information (Details)

v3.8.0.1
DEBT - Additional Information (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
extension
Oct. 12, 2017
USD ($)
Debt Instrument [Line Items]    
Credit facility borrowing capacity $ 900,000,000.0  
Line of credit facility, potential maximum borrowing capacity 1,200,000,000.0  
Line of credit facility, available for borrowing 234,200,000  
Commercial paper notes 900,000,000.0  
Commercial paper, notes outstanding $ 665,300,000  
Maximum    
Debt Instrument [Line Items]    
Debt instrument, term 1 year  
Commercial paper, maturity period range 397 days  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Debt instrument, term 5 years  
Line of credit facility, expiration date Nov. 30, 2020  
Line of credit facility, expiration date, maximum number of extensions | extension 2  
Line of credit facility, expiration date, extension period 1 year  
Outstanding borrowings $ 0  
Revolving Credit Facility | Subsequent Event    
Debt Instrument [Line Items]    
Line of credit, borrowings   $ 100,000,000
Term Loan    
Debt Instrument [Line Items]    
Line of credit facility, expiration date Nov. 30, 2018  
Letter of Credit    
Debt Instrument [Line Items]    
Letters of credit outstanding, amount $ 500,000