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Other Investments (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, All Other Investments [Abstract]  
Schedule of Other Investments and Unfunded Commitments The following table summarizes the fair value of these investments and any related unfunded commitments:    
 December 31, 2020September 30, 2021
Category of InvestmentFair ValueUnfunded
Commitments		Fair ValueUnfunded
Commitments
Private equity funds(1)
$235.4 $122.2 $307.0 $114.1 
Investments in other strategies(2)
8.0 — 16.6 — 
Total(3)
$243.4 $122.2 $323.6 $114.1 
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(1)The Company accounts for the majority of its interests in private equity funds under the equity method of accounting and uses NAV as a practical expedient, one quarter in arrears (adjusted for current period calls and distributions), to determine the fair value. These funds primarily invest in a broad range of third-party funds and direct investments. Distributions will be received as the underlying assets are liquidated over the life of the funds, which is generally up to 15 years.
(2)These are multi-disciplinary funds that invest across various asset classes and strategies, including equity, credit, and real estate. Investments are generally redeemable on a daily, monthly, or quarterly basis.
(3)Fair value attributable to the controlling interest was $164.4 million and $217.7 million as of December 31, 2020 and September 30, 2021, respectively.
Schedule of Investments without Readily Determinable Fair Value
Investments Without Readily Determinable Fair Values
The following table summarizes the cost, cumulative upward adjustments, and carrying amount of investments without readily determinable fair values:
 December 31,
2020		September 30,
2021
Cost$8.5 $8.5 
Cumulative upward adjustments5.3 25.0 
Carrying amount$13.8 $33.5