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INVESTMENTS - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Equity method investments    
Cost $ 10.1 $ 10.7
Equity in losses (4.6) (4.5)
Carrying value of equity method investments 5.5 6.2
Equity securities    
Carrying value of non-marketable equity securities 27.8 23.1
Total investments in unconsolidated affiliates $ 33.3 $ 29.3