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LONG-TERM OBLIGATIONS - 6% Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 31, 2017
Nov. 26, 2012
Nov. 13, 2007
Debt Instrument [Line Items]          
Repayments of debt $ 118.2 $ 1,329.5      
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%