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DEBT (Details)
$ in Millions
6 Months Ended
Mar. 22, 2018
USD ($)
Dec. 15, 2016
USD ($)
subsidiary
Jun. 30, 2020
USD ($)
subsidiary
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 12, 2017
USD ($)
Debt Instrument            
Repayments of outstanding indebtedness       $ 300.0    
Borrowings outstanding     $ 868.6   $ 867.6  
Line of Credit            
Debt Instrument            
Credit facility, maximum borrowing capacity   $ 25.0        
Term Loan Agreement            
Debt Instrument            
Debt instrument face amount $ 300.0   $ 300.0      
Proceeds from long-term debt $ 300.0          
Up-front fee (as percent)     0.05      
Minimum consolidated interest ratio     4.00      
Maximum consolidated leverage ratio     3.50      
Borrowings outstanding     $ 223.0   222.4  
Term Loan Agreement | LIBOR | Minimum            
Debt Instrument            
Interest rate margin (as a percent)     1.00%      
Term Loan Agreement | LIBOR | Maximum            
Debt Instrument            
Interest rate margin (as a percent)     1.50%      
Term Loan Agreement | Prime Rate | Minimum            
Debt Instrument            
Interest rate margin (as a percent)     0.00%      
Term Loan Agreement | Prime Rate | Maximum            
Debt Instrument            
Interest rate margin (as a percent)     0.50%      
3.650% Senior Notes            
Debt Instrument            
Debt instrument face amount     $ 650.0     $ 650.0
Interest rate (as a percent)     3.65%     3.65%
Redemption price     101.00%      
Borrowings outstanding     $ 645.6   $ 645.2  
Revolving Credit Agreement            
Debt Instrument            
Minimum consolidated interest ratio     4.00      
Maximum consolidated leverage ratio     3.50      
Credit facility, maximum borrowing capacity   $ 150.0        
Term of facility   5 years        
Maximum borrowing capacity, increase limit   $ 100.0        
Maximum borrowing capacity, total with increase   $ 250.0        
Number of subsidiaries designated as additional borrowers | subsidiary     0      
Borrowings outstanding     $ 0.0      
Borrowing capacity available     $ 150.0      
Revolving Credit Agreement | Minimum            
Debt Instrument            
Number of subsidiaries that may be designated as additional borrowers | subsidiary   1        
Revolving Credit Agreement | LIBOR | Minimum            
Debt Instrument            
Interest rate margin (as a percent)     1.00%      
Revolving Credit Agreement | LIBOR | Maximum            
Debt Instrument            
Interest rate margin (as a percent)     1.75%      
Revolving Credit Agreement | Prime Rate | Minimum            
Debt Instrument            
Interest rate margin (as a percent)     0.00%      
Revolving Credit Agreement | Prime Rate | Maximum            
Debt Instrument            
Interest rate margin (as a percent)     0.75%