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LONG-TERM OBLIGATIONS - 5-5/8% Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 03, 2017
Mar. 31, 2017
Jan. 31, 2017
Nov. 26, 2012
Mar. 27, 2012
Mar. 26, 2012
Nov. 13, 2007
Debt Instrument [Line Items]                      
Loss on early extinguishment of debt $ 0.0 $ 6.5 $ 0.7 $ 51.9              
Senior Notes                      
Debt Instrument [Line Items]                      
Loss on early extinguishment of debt   $ 6.5   $ 43.7              
Senior Notes | 5-5/8% Notes                      
Debt Instrument [Line Items]                      
Face amount of debt             $ 600.0        
Interest rate (as a percent) 5.625%   5.625%       5.625%        
Long-term debt $ 600.0   $ 600.0                
Senior Notes | 6% Notes                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 6.00%   6.00%     6.00% 6.00% 6.00%      
Tender offer for face amount of debt             $ 550.0        
Long-term debt               $ 850.0     $ 800.0
Senior Notes | Senior Notes, 6%, $300 Million Partial Redemption                      
Debt Instrument [Line Items]                      
Authorized repurchase amount             $ 300.0        
Senior Notes | 6-1/2% Notes                      
Debt Instrument [Line Items]                      
Interest rate (as a percent) 6.50%   6.50%   6.50% 6.50%     6.50%    
Long-term debt                   $ 300.0