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LONG-TERM DEBT - 2010 Notes (Details) - USD ($)
$ in Millions
Apr. 07, 2020
Dec. 31, 2020
Apr. 07, 2010
2010 Notes      
LONG-TERM DEBT      
Principal     $ 600.0
Series B      
LONG-TERM DEBT      
Repayments of debt $ 360.0    
Interest rate 6.67%    
Series C      
LONG-TERM DEBT      
Interest rate   6.77%  
Outstanding borrowings   $ 125.0