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Other Investments (Tables)
 3 Months Ended
Mar. 31, 2023
Investments, All Other Investments [Abstract]  
Schedule of Other Investments and Unfunded Commitments The following table summarizes the fair values of these investments and any related unfunded commitments:    
 December 31, 2022March 31, 2023
Category of InvestmentFair ValueUnfunded
Commitments		Fair ValueUnfunded
Commitments
Private equity funds(1)
$356.4 $158.3 $361.4 $154.9 
Investments in other strategies(2)
14.8 — 14.2 — 
Total(3)
$371.2 $158.3 $375.6 $154.9 
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(1)The Company accounts for the majority of its interests in private equity funds one quarter in arrears (adjusted for current period calls and distributions). 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 $275.1 million and $279.4 million as of December 31, 2022 and March 31, 2023, respectively.
Schedule of Investments without Readily Determinable Fair Value The following table summarizes the cost, cumulative unrealized gains, and carrying amount of investments without readily determinable fair values:
 December 31,
2022		March 31,
2023
Cost$8.5 $8.5 
Cumulative unrealized gains41.9 41.9 
Carrying amount$50.4 $50.4 
The following table presents the changes in Other investments:
For the Three Months Ended March 31,
20222023
Measured at NAV as a Practical ExpedientWithout Readily Determinable Fair ValuesTotalMeasured at NAV as a Practical ExpedientWithout Readily Determinable Fair ValuesTotal
Balance, beginning of period$324.8 $50.4 $375.2 $371.2 $50.4 $421.6 
Purchases and commitments15.1 — 15.1 9.8 — 9.8 
Sales and distributions(11.5)— (11.5)(11.5)— (11.5)
Net realized and unrealized gains15.3 — 15.3 6.1 — 6.1 
Balance, end of period$343.7 $50.4 $394.1 $375.6 $50.4 $426.0