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Investments in Marketable Securities
 9 Months Ended
Sep. 30, 2021
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,
2020		September 30,
2021
Cost$69.4 $68.5 
Unrealized gains5.5 8.2 
Unrealized losses(0.0 )(0.9)
Fair value$74.9 $75.8 
As of December 31, 2020 and September 30, 2021, Investments in marketable securities include consolidated Affiliate sponsored investment products with fair values of $52.3 million and $19.0 million, respectively.