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INVESTMENTS - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Equity method investments    
Carrying value of equity method investments $ 5.7 $ 6.2
Equity securities    
Carrying value of non-marketable equity securities 29.4 23.1
Total investments in unconsolidated affiliates $ 35.1 $ 29.3