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INVESTMENTS - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Equity method investments    
Carrying value of equity method investments $ 7.1 $ 5.7
Equity securities    
Carrying value of non-marketable equity securities 30.5 29.4
Total investments in unconsolidated affiliates $ 37.6 $ 35.1