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Investments in Marketable Securities
 12 Months Ended
Dec. 31, 2021
Marketable Securities [Abstract]  
Investments in Marketable Securities Investments in Marketable Securities
The following is a summary of the cost, gross unrealized gains, gross unrealized losses, and fair value of Investments in marketable securities:
December 31,
 20202021
Cost$69.4 $73.2 
Unrealized gains5.5 8.1 
Unrealized losses(0.0 )(2.8)
Fair value$74.9 $78.5 
As of December 31, 2020 and 2021, Investments in marketable securities include consolidated Affiliate sponsored investment products with fair values of $52.3 million and $42.9 million, respectively.