Quarterly report pursuant to Section 13 or 15(d)

DEBT - Additional Information (Detail)

v3.2.0.727
DEBT - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Credit facility borrowing capacity $ 750,000,000  
Line of credit facility, potential maximum borrowing capacity 1,000,000,000  
Long-term Debt 1,482,600,000 $ 1,527,900,000
Line of credit facility, available for borrowing 415,300,000  
Commercial paper notes 750,000,000  
Commercial Paper Notes Outstanding $ 333,300,000  
Minimum    
Debt Instrument [Line Items]    
Commercial paper, maturity date 1 day  
Maximum    
Debt Instrument [Line Items]    
Commercial paper, maturity date 90 days  
Letter of Credit    
Debt Instrument [Line Items]    
Long-term Debt $ 1,500,000  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Line of Credit Facility, Expiration Date Dec. 31, 2017  
Long-term Line of Credit $ 0