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INVESTMENTS - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Equity method investments    
Cost $ 10.3 $ 9.1
Equity in losses (4.8) (4.7)
Carrying value of equity method investments 5.5 4.4
Equity securities    
Carrying value of non-marketable equity securities 18.1 18.1
Total investments in unconsolidated affiliates $ 23.6 $ 22.5