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LONG-TERM OBLIGATIONS - 5-5/8% Senior Notes (Details) - Senior Notes - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 31, 2017
Nov. 26, 2012
Mar. 26, 2012
5-5/8% Notes        
Debt Instrument [Line Items]        
Face amount of debt   $ 600.0    
Interest rate (as a percent) 5.625% 5.625%    
Long-term debt $ 600.0      
6% Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent)   6.00% 6.00%  
Tender offer for face amount of debt   $ 550.0    
Senior Notes, 6%, $300 Million Partial Redemption        
Debt Instrument [Line Items]        
Authorized repurchase amount   $ 300.0    
6-1/2% Notes        
Debt Instrument [Line Items]        
Long-term debt       $ 300.0