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LONG-TERM DEBT - Schedule of Stated Maturity Dates of Long Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Long-term Debt, Fiscal Year Maturity [Abstract]    
2018 $ 120.0  
2019 0.0  
2020 0.0  
2021 0.0  
2022 0.0  
Thereafter 600.0  
Total principal $ 720.0 $ 634.5
Weighted-average coupon (percentage), 2018 [1] 5.72%  
Weighted-average coupon (percentage), Thereafter 4.37%  
[1] Represents weighted-average coupon rates for debt outstanding as of December 31, 2017.