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Investments in Marketable Securities
12 Months Ended
Dec. 31, 2020
Marketable Securities [Abstract]  
Investments in Marketable Securities Investments in Marketable SecuritiesThe following is a summary of the cost, gross unrealized gains, unrealized losses, and fair value of Investments in marketable securities:
December 31,
 20192020
Cost$57.9 $69.4 
Unrealized gains2.1 5.5 
Unrealized losses(0.6)(0.0)
Fair value$59.4 $74.9 
As of December 31, 2019 and 2020, Investments in marketable securities include consolidated Affiliate sponsored investment products with fair values of $38.1 million and $52.3 million, respectively.