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LONG TERM DEBT (Future Maturities of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Future maturities of long-term debt [Abstract]    
2018 $ 32.1  
2019 89.2  
2020 10.7  
2021 983.0  
2022 2.2  
Thereafter 252.0  
Total debt $ 1,369.2 $ 1,332.8