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DEBT (Details)
$ in Millions
3 Months Ended
Mar. 22, 2018
USD ($)
Dec. 15, 2016
USD ($)
subsidiary
Mar. 31, 2020
USD ($)
subsidiary
Dec. 31, 2019
USD ($)
Jan. 12, 2017
USD ($)
Debt Instrument          
Borrowings outstanding     $ 868.1 $ 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     $ 222.7 222.4  
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     $ 645.4 $ 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%