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DEBT AND FINANCING ARRANGEMENTS - Debt terms (Details) - USD ($)
Dec. 10, 2019
Jun. 19, 2019
Dec. 06, 2017
Mar. 13, 2014
Senior Notes | 5.150% Senior Notes        
Debt Instrument [Line Items]        
Interest rate       5.15%
Aggregate Principal       $ 250,000,000
Issue Price       99.474%
Net Proceeds       $ 246,000,000
Senior Notes | 4.000% Senior Notes        
Debt Instrument [Line Items]        
Interest rate     4.00%  
Aggregate Principal     $ 350,000,000  
Issue Price     99.78%  
Net Proceeds     $ 347,000,000  
Senior Notes | 3.900% Senior Notes        
Debt Instrument [Line Items]        
Interest rate   3.90%    
Aggregate Principal   $ 300,000,000    
Issue Price   99.36%    
Net Proceeds   $ 296,000,000    
Junior Subordinated Notes        
Debt Instrument [Line Items]        
Interest rate 4.90%      
Aggregate Principal $ 425,000,000      
Issue Price 99.00%      
Net Proceeds $ 420,750,000      
Junior Subordinated Notes | Five-Year Treasury Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.186%