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Investments in Marketable Securities
 6 Months Ended
Jun. 30, 2022
Marketable Securities [Abstract]  
Investments in Marketable Securities Investments in Marketable Securities
The following table summarizes the cost, gross unrealized gains, gross unrealized losses, and fair value of Investments in marketable securities:
 December 31,
2021		June 30,
2022
Cost$73.2 $79.5 
Unrealized gains8.1 2.1 
Unrealized losses(2.8)(15.0)
Fair value$78.5 $66.6 
As of December 31, 2021 and June 30, 2022, Investments in marketable securities include consolidated Affiliate sponsored investment products with fair values of $42.9 million and $34.3 million, respectively.