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Investments in Marketable Securities
 9 Months Ended
Sep. 30, 2022
Marketable Securities [Abstract]  
Investments in Marketable Securities Investments in Marketable Securities
Equity Securities
The following table summarizes the cost, gross unrealized gains, gross unrealized losses, and fair value of investments in equity securities:
 December 31,
2021		September 30,
2022
Cost$59.1 $73.8 
Unrealized gains8.1 10.5 
Unrealized losses(2.7)(10.9)
Fair value$64.5 $73.4 
As of December 31, 2021 and September 30, 2022, investments in equity securities include consolidated Affiliate sponsored investment products with fair values of $28.9 million and $21.2 million, respectively.
Debt Securities
The following table summarizes the cost, gross unrealized losses, and fair value of investments in U.S. Treasury Notes classified as available-for-sale, which mature in 2024, and other debt securities classified as trading:
 December 31,
2021		September 30,
2022
Cost$14.1 $113.4 
Unrealized losses(0.1)(3.1)
Fair value$14.0 $110.3 
As of December 31, 2021 and September 30, 2022, investments in debt securities classified as trading include consolidated Affiliate sponsored investment products with fair values of $14.0 million and $10.4 million, respectively.