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LONG-TERM OBLIGATIONS - 6% Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 31, 2017
Nov. 26, 2012
Nov. 13, 2007
Debt Instrument [Line Items]            
Repayments of debt   $ 443.9 $ 1,585.0      
Senior Notes | 6% Notes            
Debt Instrument [Line Items]            
Interest rate (as a percent) 6.00% 6.00%   6.00% 6.00%  
Long-term debt         $ 850.0 $ 800.0
Repurchased face amount of debt $ 850.0          
Repayments of debt 887.2          
Repurchase premium 25.9          
Interest payable $ 11.3          
Senior Notes | 8% Senior Subordinated Notes            
Debt Instrument [Line Items]            
Interest rate (as a percent)           8.00%