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INVESTMENTS - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Equity method investments    
Cost $ 9.5 $ 9.2
Equity in losses (5.4) (5.1)
Carrying value of equity method investments 4.1 4.1
Equity securities    
Carrying value of non-marketable equity securities 14.5 10.7
Total investments in unconsolidated affiliates $ 18.6 $ 14.8