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INVESTMENTS - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Equity method investments    
Cost $ 10.7 $ 9.1
Equity in losses (4.5) (4.7)
Carrying value of equity method investments 6.2 4.4
Equity securities    
Carrying value of non-marketable equity securities 23.1 18.1
Total investments in unconsolidated affiliates $ 29.3 $ 22.5