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Other Investments (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, All Other Investments [Abstract]  
Summary of Fair Value of Investments and Unfunded Commitments The following table summarizes the fair values of these investments and any related unfunded commitments:
 December 31, 2022December 31, 2023
Fair ValueUnfunded
Commitments		Fair ValueUnfunded
Commitments
Private equity funds(1)
$356.4 $158.3 $424.4 $187.2 
Investments in other strategies(2)
14.8 — 6.1 — 
   Total(3)
$371.2 $158.3 $430.5 $187.2 
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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 and credit. Investments are generally redeemable on a daily, monthly, or quarterly basis.
(3)Fair value attributable to the controlling interest was $275.1 million and $324.9 million as of December 31, 2022 and 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,
20222023
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 Years Ended December 31,
20222023
Measured at NAV as a Practical ExpedientWithout Readily Determinable Fair ValuesTotal Measured 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 
Net realized and unrealized gains(1)
1.7 — 1.7 34.2 — 34.2 
Additions and commitments104.3 — 104.3 82.5 — 82.5 
Sales and distributions(59.6)— (59.6)(57.4)— (57.4)
Balance, end of period $371.2 $50.4 $421.6 $430.5 $50.4 $480.9 
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(1)Recorded in Investment and other income.