XML 55 R38.htm IDEA: XBRL DOCUMENT
v3.22.4

Other Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
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, 2021 |  | December 31, 2022
Category of Investment |  | Fair Value |  | Unfunded Commitments |  | Fair Value |  | Unfunded Commitments
Private equity funds(1) |  | $ | 310.2 |  |  | $ | 156.3 |  |  | $ | 356.4 |  |  | $ | 158.3 |
Investments in other strategies(2) |  | 14.6 |  |  | — |  |  | 14.8 |  |  | — |
Total(3) |  | $ | 324.8 |  |  | $ | 156.3 |  |  | $ | 371.2 |  |  | $ | 158.3 |
__________________________ (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 $224.4 million and $275.1 million as of December 31, 2021 and 2022, 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,
|  |  |  |  |  | 2021 |  | 2022
Cost |  |  |  |  |  | $ | 8.5 |  |  | $ | 8.5 |
Cumulative unrealized gains |  |  |  |  |  | 41.9 |  |  | 41.9 |
Carrying amount |  |  |  |  |  | $ | 50.4 |  |  | $ | 50.4 |
The following table presents the changes in Other investments:
|  | For the Years Ended December 31,
|  | 2021 |  | 2022
|  | Measured at NAV as a Practical Expedient |  | Without Readily Determinable Fair Values |  | Total |  | Measured at NAV as a Practical Expedient |  | Without Readily Determinable Fair Values |  | Total
Balance, beginning of period |  | $ | 243.4 |  |  | $ | 13.8 |  |  | $ | 257.2 |  |  | $ | 324.8 |  |  | $ | 50.4 |  |  | $ | 375.2 |
Net realized and unrealized gains(1) |  | 79.5 |  |  | 36.6 |  |  | 116.1 |  |  | 1.7 |  |  | — |  |  | 1.7 |
Additions and commitments |  | 60.3 |  |  | — |  |  | 60.3 |  |  | 104.3 |  |  | — |  |  | 104.3 |
Sales and distributions |  | (58.4) |  |  | — |  |  | (58.4) |  |  | (59.6) |  |  | — |  |  | (59.6) |
Balance, end of period |  | $ | 324.8 |  |  | $ | 50.4 |  |  | $ | 375.2 |  |  | $ | 371.2 |  |  | $ | 50.4 |  |  | $ | 421.6 |
__________________________ (1)Recognized in Investment and other income.

X
- Definition Tabular disclosure of investments that rely on net asset value as their fair value, including the nature of the investment and any related liquidation restrictions. + References No definition available. + Details
Name: | amg_FairValueMeasurementInputsBasedOnNetAssetsTableTextBlock
Namespace Prefix: | amg_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAllOtherInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration