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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Equity Method Investments $ 0.2 $ 0.2
Proportional Amortization Investments 15.2 11.6
Cost Method Investments $ 1.6 $ 2.2