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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 1,316,395 |  | $ 1,317,705
Alignment shares, relevant measurement period following merger (in years) | 7 years |  |
Real Estate Investments (in projects and funds) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 671,005 |  | 622,826
Altus Power, Inc. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 167,682 |  | $ 219,624
Common stock shares (in shares) | 24,556,012 |  | 24,554,201
Altus Power, Inc. | Class A common stock |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 128,919 |  | $ 160,093
Shares converted to Class A common stock (in shares) |  | 2,011 |
Altus Power, Inc. | Class A common stock | Parent Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Shares converted to Class A common stock (in shares) |  | 1,811 |
Altus Power, Inc. | Alignment Shares |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Alignment shares converted (in shares) |  | 201,250 |
Alignment shares | Alignment Shares |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | 38,763 |  | 59,530
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 477,708 |  | $ 475,256

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